Shatapatha Brahmana 8.3.4.8

8.3.4.8

mūrdhāsi rāḍitīmaṃ lokamarohan | dhruvāsi dharuṇetyantarikṣalokaṃ dhartryasi dharaṇītyamuṃ dharaṇītyamuṃ lokamāyuṣe tvā varcase tvā kṛṣyai tvā kṣemāya tveti catvāraścatuṣpādāḥ paśavo 'nnam paśavasta etaiścaturbhiścatuṣpādaiḥ paśubhiretenānnenāmuṣmiṃloke pratyatiṣṭhaṃstathaivaitadyajamāna etaiścaturbhiścatuṣpādaiḥ paśubhiretenānnenāmuṣmiṃloke pratitiṣṭhati

By 'The head thou art, the ruler!' they stepped on this (terrestrial) world; by 'Steady thou art, steadfast!' on the air-world; by 'A holder thou art, a hold!' on that (heavenly) world.--'For life-strength (I bestow) thee! for vigour thee! for husbandry thee! for prosperity thee!' There are four (kinds of) four-footed (domestic) animals, and (domestic) animals are food: by means of this food, these four four-footed animals, they (the gods) established themselves in yonder world; and in like manner does the Sacrificer now by means of this food, these four four-footed animals, establish himself in yonder world.