Śrīmad-Bhāgavatam 3.12.44
SB 3.12.44
Open the full passageSanskrit
ānvīkṣikī trayī vārtā daṇḍa-nītis tathaiva ca evaṁ vyāhṛtayaś cāsan praṇavo hy asya dahrataḥ
Translation
The science of logical argument, the Vedic goals of life, and also law and order, moral codes, and the celebrated hymns bhūḥ, bhuvaḥ and svaḥ all became manifested from the mouths of Brahmā, and the praṇava oṁkāra was manifested from his heart.