Śatapatha Brāhmaṇa ("of a hundred paths") 1.8.3.17

1.8.3.17

tanmuhūrtaṃ dhārayitvānupraharati | tadyatrāsyetara ātmāgaṃstadevāsyaitadgamayatyatha yannānupraharedantariyāddha yajamānaṃ lokāttatho ha yajamānaṃ lokānnāntareti

Having held (the prastara) for a moment, he throws it into the fire: whither his (the sacrificer's) one (part of) self (or, body) went, thither he thereby causes it to go. But were he not to throw it into the fire, he would cut off the sacrificer from (yonder) world. In this way, however, he does not cut off the sacrificer from (yonder) world.