Śrīmad-Bhāgavatam 3.12.34
SB 3.12.34
Open the full passageSanskrit
kadācid dhyāyataḥ sraṣṭur vedā āsaṁś catur-mukhāt kathaṁ srakṣyāmy ahaṁ lokān samavetān yathā purā
Translation
Once upon a time, when Brahmā was thinking of how to create the worlds as in the past millennium, the four Vedas, which contain all varieties of knowledge, became manifested from his four mouths.