According to one legend, Angirasa turned his senses inwards and meditated on Para Brahman, the creator of the creator, for several years. The great Tejas he got by birth had multiplied infinitely by his penance. He attained many divine qualities, powers, and riches, and control over many worlds. But he was oblivious of all the worldly attainments and did not stop his penance. Due to this penance he became one with the Para-Brahman and thus attained the state of “Brahmarshi”. He had visions of many Vedic Mantras and brought them to this earthly world. He is credited as being the source of great number of Vedic Hymns and mantras and also believed to have introduced fire-worship along with sage Bhrigu.
https://freeglobaluniversity.blogspot.com/search/label/BrahmaDevaMahaRajaRishi
