Shatapatha Brahmana 4.5.5.7

4.5.5.7

śukrapātramevānu manuṣyāḥ prajāyante | taddvai tatpunaryajñe prayujyate tasmādimāḥ prajāḥ punarabhyāvartam prajāyanta eṣa vai śukro ya eṣa tapatyeṣa u evendraḥ puruṣo vai paśūnāmaindrastasmātpaśūnāmīṣṭe

After the Sukra cup men are produced. Now that (cup) is again employed at the sacrifice: hence creatures are here produced again and again. But the Sukra (bright) is the same as he that burns yonder, and he indeed is Indra; and of animals, man is Indra-like: whence he rules over animals.