SB 3.7.25

prajāpatīnāṁ sa patiś
 cakḷpe kān prajāpatīn
sargāṁś caivānusargāṁś ca
 manūn manvantarādhipān
Synonyms: 
prajā-patīnām — of the demigods like Brahmā and others; saḥ — he; patiḥ — leader; cakḷpe — decided; kān — whomsoever; prajāpatīn — fathers of the living entities; sargān — generations; ca — also; eva — certainly; anusargān — later generations; ca — and; manūn — the Manus; manvantara-adhipān — and the changes of such.
Translation: 
O learned brāhmaṇa, please describe how the leader of all the demigods, namely the Prajāpati, Brahmā, decided to establish the various Manus, the heads of the ages. Please describe the Manus also, and please describe the descendants of those Manus.
Purport: 

The human race, or manuṣya-sara, descends from the Manus, sons and grandsons of the Prajāpati, Brahmā. The descendants of Manu reside in all the different planets and rule all the universe.