Answer is:
Rugveda
Explanation:
The Vedas are a large body of religious texts originating in ancient India. Composed in Vedic Sanskrit, the texts constitute the oldest layer of Sanskrit literature and the oldest scriptures of Hinduism. There are four Vedas: the Rigveda, the Yajurveda, the Samaveda and the Atharvaveda. Rigveda is the first and oldest veda.
