1. Rigveda

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Scripts

Rigveda manuscripts in paper, palm leaves and birch bark form, either in full or in portions, have been discovered in the following Indic scripts:

Devanagari (Rajasthan, Maharashtra, Uttar Pradesh, Nepal)
Grantha (Tamil Nadu)
Malayalam (Kerala)
Nandinagari (South India)
Sharada (Kashmir)

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Comparison

The various Rigveda manuscripts discovered so far show some differences. Broadly, the most studied Śākala recension has 1017 hymns, includes an appendix of eleven valakhīlya hymns which are often counted with the eighth mandala, for a total of 1028 metrical hymns. The Bāṣakala version of Rigveda includes eight of these vālakhilya hymns among its regular hymns, making a total of 1025 hymns in the main text for this śākhā. The Bāṣakala text also has an appendix of 98 hymns, called the Khilani, bringing the total to 1,123 hymns. The manuscripts of Śākala recension of the Rigveda have about 10,600 verses, organized into ten Books (Mandalas). Books 2 through 7 are internally homogeneous in style, while Books 1, 8 and 10 are compilation of verses of internally different styles suggesting that these books are likely a collection of compositions by many authors.

The first mandala is the largest, with 191 hymns and 2006 verses, and it was added to the text after Books 2 through 9. The last, or the 10th Book, also has 191 hymns but 1754 verses, making it the second largest. The language analytics suggest the 10th Book, chronologically, was composed and added last. The content of the 10th Book also suggest that the authors knew and relied on the contents of the first nine books.

The Rigveda is the largest of the four Vedas, and many of its verses appear in the other Vedas. Almost all of the 1875 verses found in Samaveda are taken from different parts of the Rigveda, either once or as repetition, and rewritten in a chant song form. Books 8 and 9 of the Rigveda are by far the largest source of verses for Sama Veda. Book 10 contributes the largest number of the 1350 verses of Rigveda found in Atharvaveda, or about one fifth of the 5987 verses in the Atharvaveda text. A bulk of 1875 ritual-focussed verses of Yajurveda, in its numerous versions, also borrow and build upon the foundation of verses in Rigveda.

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Contents : Altogether the Rigveda consists of:

the Samhita (hymns to the deities, the oldest part of the Rigveda)
the Brahmanas, commentaries on the hymns
the Aranyakas or "forest books"
the Upanishads

In western usage, "Rigveda" usually refers to the Rigveda Samhita, while the Brahmanas are referred to as the "Rigveda Brahmanas" (etc.). Technically speaking, however, "the Rigveda" refers to the entire body of texts transmitted along with the Samhita portion. Different bodies of commentary were transmitted in the different shakhas or "schools". 
Only a small portion of these texts has been preserved: The texts of only two out of five shakhas mentioned by the Rigveda Pratishakhya have survived. The late (15th or 16th century) Shri Guru Charitra even claims the existence of twelve Rigvedic shakhas. The two surviving Rigvedic corpora are those of the Śākala and the Bāṣkala shakhas.

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Hymns

The Rigvedic hymns are dedicated to various deities, chief of whom are Indra, a heroic god praised for having slain his enemy Vrtra; Agni, the sacrificial fire; and Soma, the sacred potion or the plant it is made from. Equally prominent gods are the Adityas or Asura gods Mitra–Varuna and Ushas (the dawn). Also invoked are Savitr, Vishnu, Rudra, Pushan, Brihaspati or Brahmanaspati, as well as deified natural phenomena such as Dyaus Pita (the shining sky, Father Heaven), Prithivi (the earth, Mother Earth), Surya (the sun god), Vayu or Vata (the wind), Apas (the waters), Parjanya (the thunder and rain), Vac (the word), many rivers (notably the Sapta Sindhu, and the Sarasvati River). The Adityas, Vasus, Rudras, Sadhyas, Ashvins, Maruts, Rbhus, and the Vishvadevas ("all-gods") as well as the "thirty-three gods" are the groups of deities mentioned.

Mandala 1 comprises 191 hymns. Hymn 1.1 is addressed to Agni, and his name is the first word of the Rigveda. The remaining hymns are mainly addressed to Agni and Indra, as well as Varuna, Mitra, the Ashvins, the Maruts, Usas, Surya, Rbhus, Rudra, Vayu, Brhaspati, Visnu, Heaven and Earth, and all the Gods. This Mandala is dated to have been added to the Rigveda after Mandala 2 through 9, and includes the philosophical Riddle Hymn 1.164, which inspires chapters in later Upanishads such as the Mundaka.

Mandala 2 comprises 43 hymns, mainly to Agni and Indra. It is chiefly attributed to the Rishi gṛtsamada śaunahotra.

Mandala 3 comprises 62 hymns, mainly to Agni and Indra and the Vishvedevas. The verse 3.62.10 has great importance in Hinduism as the Gayatri Mantra. Most hymns in this book are attributed to viśvāmitra gāthinaḥ.

Mandala 4 comprises 58 hymns, mainly to Agni and Indra as well as the Rbhus, Ashvins, Brhaspati, Vayu, Usas, etc. Most hymns in this book are attributed to vāmadeva gautama.

Mandala 5 comprises 87 hymns, mainly to Agni and Indra, the Visvedevas ("all the gods'), the Maruts, the twin-deity Mitra-Varuna and the Asvins. Two hymns each are dedicated to Ushas (the dawn) and to Savitr. Most hymns in this book are attributed to the atri clan.

Mandala 6 comprises 75 hymns, mainly to Agni and Indra, all the gods, Pusan, Ashvin, Usas, etc. Most hymns in this book are attributed to the bārhaspatya family of Angirasas.

Mandala 7 comprises 104 hymns, to Agni, Indra, the Visvadevas, the Maruts, Mitra-Varuna, the Asvins, Ushas, Indra-Varuna, Varuna, Vayu (the wind), two each to Sarasvati (ancient river/goddess of learning) and Vishnu, and to others. Most hymns in this book are attributed to vasiṣṭha maitravaruṇi.

Mandala 8 comprises 103 hymns to various gods. Hymns 8.49 to 8.59 are the apocryphal vālakhilya. Hymns 1–48 and 60–66 are attributed to the kāṇva clan, the rest to other (Angirasa) poets.

Mandala 9 comprises 114 hymns, entirely devoted to Soma Pavamana, the cleansing of the sacred potion of the Vedic religion.

Mandala 10 comprises additional 191 hymns, frequently in later language, addressed to Agni, Indra and various other deities. It contains the Nadistuti sukta which is in praise of rivers and is important for the reconstruction of the geography of the Vedic civilization and the Purusha sukta which has been important in studies of Vedic sociology. It also contains the Nasadiya sukta (10.129) which deals with multiple speculations about the creation of universe, and whether anyone can know the right answer. The marriage hymns (10.85) and the death hymns (10.10–18) still are of great importance in the performance of the corresponding Grhya rituals.

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Rigveda Brahmanas

Of the Brahmanas that were handed down in the schools of the Bahvṛcas (i.e. "possessed of many verses"), as the followers of the Rigveda are called, two have come down to us, namely those of the Aitareyins and the Kaushitakins. The Aitareya-brahmana and the Kaushitaki- (or Sankhayana-) brahmana evidently have for their groundwork the same stock of traditional exegetic matter. They differ, however, considerably as regards both the arrangement of this matter and their stylistic handling of it, with the exception of the numerous legends common to both, in which the discrepancy is comparatively slight. There is also a certain amount of material peculiar to each of them.

Devi sukta, which highlights the goddess tradition of Hinduism is found in Rigveda hymns 10.125. It is cited in Devi Mahatmya and is recited every year during the Durga Puja festival.

The Kaushitaka is, upon the whole, far more concise in its style and more systematic in its arrangement features which would lead one to infer that it is probably the more modern work of the two. It consists of 30 chapters (adhyaya); while the Aitareya has 40, divided into eight books (or pentads, pancaka), of five chapters each. The last 10 adhyayas of the latter work are, however, clearly a later addition though they must have already formed part of it at the time of Pāṇini (c. 5th century BCE), if, as seems probable, one of his grammatical sutras, regulating the formation of the names of Brahmanas, consisting of 30 and 40 adhyayas, refers to these two works. In this last portion occurs the well-known legend (also found in the Shankhayana-sutra, but not in the Kaushitaki-brahmana) of Shunahshepa, whom his father Ajigarta sells and offers to slay, the recital of which formed part of the inauguration of kings.

While the Aitareya deals almost exclusively with the Soma sacrifice, the Kaushitaka, in its first six chapters, treats of the several kinds of haviryajna, or offerings of rice, milk, ghee, etc., whereupon follows the Soma sacrifice in this way, that chapters 7–10 contain the practical ceremonial and 11–30 the recitations (shastra) of the hotar. Sayana, in the introduction to his commentary on the work, ascribes the Aitareya to the sage Mahidasa Aitareya (i.e. son of Itara), also mentioned elsewhere as a philosopher; and it seems likely enough that this person arranged the Brahmana and founded the school of the Aitareyins. Regarding the authorship of the sister work we have no information, except that the opinion of the sage Kaushitaki is frequently referred to in it as authoritative, and generally in opposition to the Paingya—the Brahmana, it would seem, of a rival school, the Paingins. Probably, therefore, it is just what one of the manuscripts calls it—the Brahmana of Sankhayana (composed) in accordance with the views of Kaushitaki.

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Rigveda Aranyakas and Upanishads

Each of these two Brahmanas is supplemented by a "forest book", or Aranyaka. The Aitareyaranyaka is not a uniform production. It consists of five books (aranyaka), three of which, the first and the last two, are of a liturgical nature, treating of the ceremony called mahavrata, or great vow. The last of these books, composed in sutra form, is, however, doubtless of later origin, and is, indeed, ascribed by Hindu authorities either to Shaunaka or to Ashvalayana. 
The second and third books, on the other hand, are purely speculative, and are also styled the Bahvrca-brahmana-upanishad. Again, the last four chapters of the second book are usually singled out as the Aitareya Upanishad, ascribed, like its Brahmana (and the first book), to Mahidasa Aitareya; and the third book is also referred to as the Samhita-upanishad. 
As regards the Kaushitaki-aranyaka, this work consists of 15 adhyayas, the first two (treating of the mahavrata ceremony) and the 7th and 8th of which correspond to the first, fifth, and third books of the Aitareyaranyaka, respectively, whilst the four adhyayas usually inserted between them constitute the highly interesting Kaushitaki (Brahmana-) Upanishad, of which we possess two different recensions. The remaining portions (9–15) of the Aranyaka treat of the vital airs, the internal Agnihotra, etc., ending with the vamsha, or succession of teachers.

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Significance

The text is a highly stylized poetical Vedic Sanskrit with praise addressed to the Vedic gods and chieftains. Most hymns, according to Witzel, were intended to be recited at the annual New Year Soma ritual. The text also includes some nonritual poetry, fragments of mythology, archaic formulas, and a number of hymns with early philosophical speculations. Composed by the poets of different clans, including famed Vedic rishis (sages) such as Vishvamitra and Vasishtha, these signify the power of prestige therewith to vac (speech, sound), a tradition set in place. 
The text introduced the prized concepts such as Rta (active realization of truth, cosmic harmony) which inspired the later Hindu concept of Dharma. The Rigvedic verses formulate this Rta as effected by Brahman, a significant and non-self-evident truth. The text also contains hymns of "highly poetical value" – some in dialogue form, along with love stories that likely inspired later Epic and classical poets of Hinduism, states Witzel.

According to Nadkarni, several hymns of the Rigveda embed cherished virtues and ethical statements. For example, verses 5.82.7, 6.44.8, 9.113.4, 10.133.6 and 10.190.1 mention truthful speech, truthful action, self-discipline and righteousness. Hymn 10.117 presents the significance of charity and of generosity between human beings, how helping someone in need is ultimately in the self-interest of the helper, its importance to an individual and the society. 
According to Jamison and Brereton, hymns 9.112 and 9.113 poetically state, "what everyone [humans and all living beings] really want is gain or an easy life", even a water drop has a goal – namely, "simply to seek Indra". These hymns present the imagery of being in heaven as "freedom, joy and satisfaction", a theme that appears in the Hindu Upanishads to characterize their teachings of self-realization.

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Monism debate

While the older hymns of the Rigveda reflect sacrificial ritual typical of polytheism, its younger parts, specifically mandalas 1 and 10, have been noted as containing monistic or henotheistic speculations.

A widely cited example of such speculations is hymn 1.164.46:

They call him Indra, Mitra, Varuna, Agni, and he is heavenly nobly-winged Garutman.
To what is One, sages give many a title they call it Agni, Yama, Matarisvan.

— Rigveda 1.164.46, Translated by Ralph Griffith

Max Müller notably introduced the term "henotheism" for the philosophy expressed here, avoiding the connotations of "monotheism" in Judeo-Christian tradition. Other widely cited examples of monistic tendencies include hymns 1.164, 8.36 and 10.31, Other scholars state that the Rigveda includes an emerging diversity of thought, including monotheism, polytheism, henotheism and pantheism, the choice left to the preference of the worshipper. and the Nasadiya Sukta (10.129), one of the most widely cited Rigvedic hymns in popular western presentations.

Ruse (2015) commented on the old discussion of "monotheism" vs. "henotheism" vs. "monism" by noting an "atheistic streak" in hymns such as 10.130.

Examples from Mandala 1 adduced to illustrate the "metaphysical" nature of the contents of the younger hymns include: 1.164.34: "What is the ultimate limit of the earth?", "What is the center of the universe?", "What is the semen of the cosmic horse?", "What is the ultimate source of human speech?"; 1.164.34: "Who gave blood, soul, spirit to the earth?", "How could the unstructured universe give origin to this structured world?"; 1.164.5: "Where does the sun hide in the night?", "Where do gods live?"; 1.164.6: "What, where is the unborn support for the born universe?"; 1.164.20 (a hymn that is widely cited in the Upanishads as the parable of the Body and the Soul): "Two birds with fair wings, inseparable companions; Have found refuge in the same sheltering tree. One incessantly eats from the fig tree; the other, not eating, just looks on.".

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Reception in Hinduism :Shruti

The Vedas as a whole are classed as "shruti" in Hindu tradition. This has been compared to the concept of divine revelation in Western religious tradition, but Staal argues that "it is nowhere stated that the Veda was revealed", and that shruti simply means "that what is heard, in the sense that it is transmitted from father to son or from teacher to pupil". 
The Rigveda, or other Vedas, do not anywhere assert that they are apauruṣeyā, and this reverential term appears only centuries after the end of the Vedic period in the texts of the Mimamsa school of Hindu philosophy. The text of the Rigveda suggests it was "composed by poets, human individuals whose names were household words" in the Vedic age, states Staal.

The authors of the Brāhmana literature discussed and interpreted the Vedic ritual.

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Sanskrit grammarians

Yaska (4th c. BCE), a lexicographer, was an early commentator of the Rigveda by discussing the meanings of difficult words. In his book titled Nirukta Yaska asserts that the Rigveda in the ancient tradition can be interpreted in three ways – from the perspective of religious rites (adhiyajna), from the perspective of the deities (adhidevata), and from the perspective of the soul (adhyatman). 
The fourth way to interpret the Rigveda also emerged in the ancient times, wherein the gods mentioned were viewed as symbolism for legendary individuals or narratives. It was generally accepted that creative poets often embed and express double meanings, ellipses and novel ideas to inspire the reader.