Śatapatha Brāhmaṇa ("of a hundred paths") 7.5.2.1

7.5.2.1

paśuśīrṣāṇyupadadhāti | paśavo vai paśuśīrṣāṇi paśūnevaitadupadadhāti tānyukhāyāmupadadhātīme vai lokā ukhā paśavaḥ paśuśīrṣāṇyeṣu tallokeṣu paśūndadhāti tasmādima eṣu lokeṣu paśavaḥ

He puts the heads of the victims in (the fire-pan),--the heads of the victims being animals (or cattle), it is animals he thus puts thereon. He puts them in the fire-pan;--the pan being these worlds, and the heads of the victims being beasts, he thus puts animals in these worlds; whence there are animals in these worlds.