Śatapatha Brāhmaṇa ("of a hundred paths") 7.5.2.17

7.5.2.17

payasi puruṣamupadadhāti | paśavo vai payo yajamānaṃ tatpaśuṣu pratiṣṭhāpayatyādityaṃ garbham payasā samaṅgdhītyādityo vā eṣa garbho yatpuruṣastam payasā samaṅgdhītyetatsahasrasya pratimāṃ viśvarūpamiti puruṣo vai sahasrasya pratimā puruṣasya hyeva sahasram bhavati parivṛṅgdhi harasā mābhimaṃsthā iti paryenaṃ vṛṅgdhyarciṣā mainaṃ hiṃsīrityetacatāyuṣaṃ kṛṇuhi cīyamāna iti puruṣaṃ tatpaśūnāṃ śatāyuṃ karoti tasmātpuruṣa eva paśūnāṃ śatāyuḥ

The (head of the) man he places on the milk,--milk means cattle: he thus establishes the Sacrificer among cattle,--with (Vâg. S. XIII, 41), 'With milk anoint thou Âditya, the unborn child!' that unborn child, the man, is indeed the sun: thus, Him anoint thou with milk!--'the all-shaped maker of a thousand,' the maker of a thousand is man; for to him belong a thousand;--'spare him with thy heat, harbour not evil thoughts against him!' that is, spare him with thy fire, do not hurt him!--'make him live a hundred years, while thou art built!' he thereby makes man the one among animals (capable of) living a hundred years; whence man, among animals, lives up to- a hundred years.