"Vedic religion". Encyclopedia Britannica. https://www.britannica.com/topic/Vedic-religion. "It [Vedic religion] takes its name from the collections of sacred texts known as the Vedas. Vedism is the oldest stratum of religious activity in India for which there exist written materials. It was one of the major traditions that shaped Hinduism."
encyclopedia.com
Jan C. Heesterman (1987) (1987), Vedism and Brahmanism, MacMillan Encyclopedia of Religion