Bhagavatapurana 3.12.33

3.12.33

sa itthaṃ gṛṇataḥ putrān puro dṛṣṭvā prajāpatīn /
prajāpati-patis tanvaṃ tatyāja vrīḍitas tadā /
tāṃ diśo jagṛhur ghorāṃ nīhāraṃ yad vidus tamaḥ //

33. When he saw before him his own sons, the progenitors of the world, wisely speaking thus, the Lord of Prajāpatis was ashamed and cast off his body.

34. The directions embraced that fearful body which the learned speak of as mist or darkness. Once when he was contemplating how he should create the well-arranged worlds as they were before, the Vedas issued forth from the four faces of the maker (his four faces.)