Śatapatha Brāhmaṇa ("of a hundred paths") 7.1.2.7

7.1.2.7

tasyāyameva lokaḥ pratiṣṭhā | atha yo 'smiṃloke 'gniḥ so 'syāvāṅ prāṇo 'thāsyāntarikṣamātmātha yo 'ntarikṣe vāyurya evāyamātmanprāṇaḥ so 'sya sa dyaurevāsya śiraḥ sūryācandramasau cakṣuṣī yaccakṣuradhyaśeta sa candramāstasmātsa mīlitatataro 'nnaṃ hi tasmādasravat

This (terrestrial) world truly is his foundation; and what fire there is in this world that is his (Pragâpati's) downward vital air. And the air is his body, and what wind there is in the air, that is that vital air of his in the body. And the sky is his head; the sun and the moon are his eyes. The eye on which he lay is the moon: whence that one is much closed up, for the food flowed therefrom.