Mbh 1.64.7

“And all the gods with Indra, on hearing these words of the Lord of the celestials--words that were true, desirable under the circumstances, and fraught with benefit,--accepted them. And they all having resolved to come down on earth in their respected parts, then went to Narayana, the slayer of all foes, at Vaikunth--the one who has the discus and the mace in his hands, who is clad in purple, who is of great splendour, who hath the lotus on his navel, who is the slayer of the foes of the gods, who is of eyes looking down upon his wide chest (in yoga attitude), who is the lord of the Prajapati himself, the sovereign of all the gods, of mighty strength, who hath the mark of the auspicious whirl on his breast, who is the mover of every one’s faculties and who is adored by all the gods. Him, Indra the most exalted of persons, addressed, saying, “Be incarnate.” And Hari replied,--‘Let it be.’”