The Vedic forms of belief are one of the precursors to modern Hinduism.Texts considered to date to the Vedic period are mainly the four Vedas, but the Brahmanas, Aranyakas and the older Upanishads as well as the oldest Shrautasutras are also considered to be Vedic. The Vedas record the liturgy connected with the rituals and sacrifices performed by the 16 or 17 Shrauta priests and the purohitas.
The rishis, the composers of the hymns of the Rigveda, were considered inspired poets and seers (in post-Vedic times understood as "hearers" of an eternally existing Veda, Śrauta means "what is heard").
The mode of worship was the performance of sacrifices (Yajna) which included the chanting of Rigvedic verses (see Vedic chant), singing of Samans and 'mumbling' of sacrificial mantras (Yajus). Yajna involved sacrifice and sublimation of the havana sámagri (herbal preparations) in the fire accompanied by the chanting of the Vedic mantras. The sublime meaning of the word yajna is derived from the Sanskrit verb yaj, which has a three-fold meaning of worship of deities (devapujana), unity (saògatikaraña) and charity (dána). An essential element was the sacrificial fire - the divine Agni - into which oblations were poured, as everything offered into the fire was believed to reach God. People prayed for abundance of rain, cattle, sons, long life and gaining 'heaven'.Vedic people believed in the transmigration of the soul and the peepul tree and cow were sanctified by the time of the Atharva Veda. Many of the concepts of Indian philosophy espoused later like Dharma, Karma etc. trace their root to the Vedas.
The main deities of the Vedic pantheon were Indra, Agni (the sacrificial fire), and Soma and some deities of social order such as Mitra–Varuna, Aryaman, Bhaga and Amsa, further nature deities such as Surya (the Sun), Vayu (the wind), Prithivi (the earth). Goddesses included Ushas (the dawn), Prithvi and Aditi (the mother of the Aditya gods or sometimes the cow). Rivers, especially Saraswati, were also considered goddesses. Deities were not viewed as all-powerful. The relationship between humans and the deity was one of transaction, with Agni (the sacrificial fire) taking the role of messenger between the two. Strong traces of a common Indo-Iranian religion remain visible, especially in the Soma cult and the fire worship, both of which are preserved in Zoroastrianism.
Ethics in the Vedas are based on the concepts of Satya and Rta. Satya is the principle of integration rooted in the Absolute. Whereas, Ṛta is the expression of Satya, which regulates and coordinates the operation of the universe and everything within it. Conformity with Ṛta would enable progress whereas its violation would lead to punishment.
Vedic religion evolved into the Hindu paths of Yoga and Vedanta, a religious path considering itself the 'essence' of the Vedas, interpreting the Vedic pantheon as a unitary view of the universe with 'God' (Brahman) seen as immanent and transcendent in the forms of Ishvara and Brahman. These post-Vedic systems of thought, along with later texts like Upanishads, epics (namely Gita of Mahabharat), have been fully preserved and form the basis of modern Hinduism. The ritualistic traditions of Vedic religion are preserved in the conservative Śrauta tradition.