Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 8
Sanskrit:
पद्मकोशं तदाविश्य भगवत्कर्मचोदित: ।एकं व्यभाङ्क्षीदुरुधा त्रिधा भाव्यं द्विसप्तधा ॥ ८ ॥
ITRANS:
padma-kośaṁ tadāviśyabhagavat-karma-coditaḥekaṁ vyabhāṅkṣīd urudhātridhā bhāvyaṁ dvi-saptadhā
Translation:
Thus engaged in the service of the Supreme Personality of Godhead, Lord Brahmā entered into the whorl of the lotus, and as it spread all over the universe he divided it into three divisions of worlds and later into fourteen divisions.