Mbh 12.337.1a

"'Bhishma said, "Then upon the expiration of the great Kalpa, when the celestial Purohita Vrihaspati was born in the race of Angiras, all the deities became very happy. The words, Vrihat, Brahma, and Mahat all bear the same sense.[1800] The celestial Purohita, O king came to be called Vrihaspati because he was endued with all these attributes. King Uparichara, otherwise called Vasu, became a disciple of Vrihaspati and soon became the foremost of his disciples. Admitted as such, he began to study at the feet of his preceptor that science which was composed by the seven Rishis who were (otherwise) known by the name of Chitrasikhandins. With soul cleansed from all sorts of evil by sacrifices and other religious rites, he ruled the Earth like Indra ruling the Heaven. The illustrious king performed a great Horse-sacrifice in which his preceptor Vrihaspati became the Hota. The sons of Prajapati (Brahman) themselves, viz., Ekata, Dwita, and Trita, became the Sadasyas in that sacrifice.[1801] There were others also who became Sadasyas in that sacrifice, viz., Dhanusha, Raivya, Arvavasu, Parvavasu, the Rishi Medhatithi, the great Rishi Tandya, the blessed Rishi Santi, otherwise called Vedasiras, the foremost of Rishis, viz., Kapila, who was the father of Salihotra, the first Kalpa, Tittiri the elder brother of Vaisampayana, Kanwa, and Devahotra, in all forming sixteen. In that great sacrifice, O monarch, all the requisite articles were collected. No animals were slain in it. The king had ordained it so. He was full of compassion. Of pure and liberal mind, he had cast off all desires, and was well-conversant with all rites. The requisites of that sacrifice all consisted of the products of the wilderness. The ancient God of gods (viz., Hari), became highly gratified with the king on account of that sacrifice. Incapable of being seen by any one else, the great God showed himself to his worshipper.