Shatapatha Brahmana 9.1.2.7

9.1.2.7

yadveva vipalyayate | etadvā enametadanvavaiti tata evaitadātmānamapoddharate jīvātvai tatho hānenātmanā sarvamāyureti

And, again, as to why he perambulates it,--he then (in sprinkling the altar) goes after him (Agni-Rudra): thereupon he now recovers his own self unto life, and so does he by that self of his obtain all vital power.