Śatapatha Brāhmaṇa ("of a hundred paths") 13.2.4.1

13.2.4.1

prajāpatirakāmayata ubhau lokāvabhijayeyaṃ devalokaṃ ca manuṣyalokaṃ ceti sa etānpaśūnapaśyadgrāmyāṃśca tānālabhata tairimau lokāvavārunddha grāmyaireva paśubhirimaṃ lokamavārunddhāraṇyairamumayaṃ vai loko manuṣyaloko'thāsau devaloko yadgrāmyānpaśūnālabhata imameva tairlokaṃ yajamāno'varunddhe yadāraṇyānamuṃ taiḥ

Pragâpati desired, 'Would that I might gain both worlds, the world of the gods, and the world of men.' He saw those beasts, the tame and the wild ones; he seized them, and by means of them took possession of these two worlds: by means of the tame beasts he took possession of this (terrestrial) world, and by means of the wild beasts of yonder (world); for this world is the world of men, and yonder world is the world of the gods. Thus when he seizes tame beasts he thereby takes possession of this world, and when wild beasts, he thereby (takes possession) of yonder (world).