SB 3.20.10
ye maricy-adayo vipra
yas tu svayambhuvo manuh
te vai brahmana adesat
katham etad abhavayan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Vidura inquired: How did the Prajapatis [such progenitors of living entities as Marici and Svayambhuva Manu] create according to the instruction of Brahma, and how did they evolve this manifested universe?