Śatapatha Brāhmaṇa ("of a hundred paths") 11.2.6.13

11.2.6.13

tadāhuḥ ātmayājī śreyā3ndevayājī3 ityātmayājīti ha brūyātsa ha vā ātmayājī yo vededam me'nenāṅgaṃ saṃskriyata idam me'nenāṅgamupadhīyata iti sa yathāhistvaco nirmucyetaivamasmānmartyācarīrātpāpmano nirmucyate sa ṛṅmayo yajurmayaḥ sāmamaya āhutimayaḥ svargaṃ lokamabhisambhavati

As to this they ask, 'Who is the better one, the self-offerer, or the god-offerer?' Let him say, 'The self-offerer;' for a self-offerer, doubtless, is he who knows, 'This my (new) body is formed by that (body of Yagña, the sacrifice), this my (new) body is procured thereby.' And even as a snake frees itself from its skin, so does he free himself from his mortal body, from sin; and made up of the Rik, the Yagus, the Sâman, and of offerings, does he pass on to the heavenly world.