Shatapatha Brahmana 9.1.1.33

9.1.1.33

yadveva pratyavarohati | etadvā enānetatprīṇannanvavaiti tata evaitadātmānamapoddharate jāvātvai tathā hānenātmanā sarvamāyureti

And, again, as to why he descends. Then (in the preceding oblations) he goes after those (gods), gratifying (propitiating) them. From thence he now recovers his own self unto life; and so does he by that self of his attain all vital power.