Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.4.5

2.3.4.5

atha yasmādupaiva tiṣṭheta | yajño vai devānāmāśīryajamānasya tadvā eṣa eva yajño yadāhutirāśīreva yajamānasya tadyadevāsyātra tadevaitadupatiṣṭhamānaḥ kurute tasmādupaiva tiṣṭheta

Then as to why he should nevertheless approach (the fires). The sacrifice, assuredly, belongs to the gods, and the prayer for blessing to the sacrificer. Now the (Agnihotra) libation, doubtless, is the same as the sacrifice; and what he does in now approaching (the fires), that indeed is the sacrificer's prayer for blessing.