The Religion and Philosophy of the Veda and Upanishads v1.c22.s1.6

v1.c22.s1.6

On the other hand, there is abundant proof that the Aṅgirases were treated by the poets as a real clan, and that many Vedic personages claimed to be descended from them: we cannot really doubt that there was such a family: in the Atharvaveda⁴ we have clear enough evidence that the Atharvans and the Aṅgirases were two sets of priests who contributed the former the auspicious, the latter the black magic side of that Veda. We find many points in the ritual such as the Aṅgirasām Ayana, the Aṅgirasāṁ Dvirātra, and many individual inventors of ceremonies who claimed to be Aṅgirases.