Śatapatha Brāhmaṇa ("of a hundred paths") 6.7.4.3

6.7.4.3

divaspari prathamaṃ jajñe agniriti | prāṇo vai divaḥ prāṇādu vā eṣa prathamamajāyatāsmaddvitīyam pari jātavedā iti yadenamado dvitīyam puruṣavidho 'janayattṛtīyamapsviti yadenamadastṛtīyamadbhyo 'janayannṛmaṇa ajasramiti prajāpatirvai nṛmaṇā agnirajasra indhāna enaṃ jarate svādhīriti yo vā enaminddhe sa enaṃ janayate svādhīḥ

[Vâg. S. XII, 18-20] 'From the sky Agni was first born;'--the sky, doubtless, is the breath, and from the breath he (Agni) was indeed first born,--'from us the second time, the knower of beings,'--inasmuch as he, man-like, on that occasion generated him a second time;--'the third time in the waters,'--inasmuch as he there did generate him a third time from the waters;--'he, the manly-minded, (kindling him) the imperishable,'--the manly-minded, doubtless, is Pragâpati; and the imperishable, Agni;--'kindling him the mindful praises (gar) him,'--for he who kindles him generates him, mindful.