Sanskrit in terms of its literary association is classified into two different periods, the Vedic and Classical.

prehistoric derivation
The separation of Proto-Indo-Iranian language into Avestan and Vedic Sanskrit is estimated, on linguistic grounds, to have occurred around or before 1800 BCE. The date of composition of the oldest hymns of the Rigveda is vague at best, generally estimated to roughly 1500 BCE.

Classical Sanskrit has its origin in the end of the Vedic period when the Upanishads were the last sacred texts to be written down, after which Panini, a descendant of Pani and a grammar and linguistic researcher, introduced the refined version of the language.

The Vedas are the sacred scriptures of Hinduism and are regarded as the oldest religious texts in the world. Thought to have been composed at least 3,500 years ago, the Vedas are a collection of hymns, magical incantations, dramatic mythological accounts, and sacred formulas for enlightenment.