Bhagavatapurana 2.2.34

2.2.34

bhagavān brahma kārtsnyena triranvīkṣya manīṣayā /
tadadhyavasyat kūṭastho ratirātman yato bhavet //

34\. The great Brahma four-faced (unchanged in spirit), who is the first and foremost of all created things, thrice studied and investigated into all the Vedas, and, by force of reason, conclusively understood that course by which intense delight in (devotion to) Atman (Hari) is (necessarily) produced.