SB 3.10.8
padma-kosam tadavisya
bhagavat-karma-coditah
ekam vyabhanksid urudha
tridha bhavyam dvi-saptadha
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thus engaged in the service of the Supreme Personality of Godhead, Lord Brahma 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.