Śatapatha Brāhmaṇa ("of a hundred paths") 11.2.2.5

11.2.2.5

atha yadvaṣaṭkṛte juhoti eṣa vai vaṣaṭkāro ya eṣa tapati sa eṣa mṛtyustadenamupariṣṭānmṛtyoḥ saṃskaroti tadenamato janayati sa etam mṛtyumatimucyate yajño vā asyātmā bhavati tadyajña eva bhūtvaitanmṛtyumatimucyata eteno hāsya sarve yajñakratava etam mṛtyumatimuktāḥ

And when he offers, after the Vashat has been uttered,--that Vashat-call being yonder shining (sun), and he being the same as Death --he thereby consecrates him (the Sacrificer) after death, and causes him to be born from out of it, and he is delivered from that death. And the sacrifice, indeed, becomes his body: thus, having become the sacrifice, he is delivered from that death, and all his chief offerings are thereby delivered from that death.