Shatapatha Brahmana 6.5.1.5

6.5.1.5

mitraḥ saṃsṛjya | pṛthivīm bhūmiṃ ca jyotiṣā saheti prāṇo vai mitraḥ prāṇo vā etadagre karmākarotsujātaṃ jātavedasamayakṣmāya tvā saṃsṛjāmi prajābhya iti yathaiva yajustathā bandhuḥ

[Vâg. S. XI, 53] 'Mitra having mixed the earth and ground with light,'--Mitra doubtless is the breath, and the breath first did this sacred work;--'I mix (fashion) thee, the well-born knower of beings, for health to creatures,'--as the text, so its meaning.