Śatapatha Brāhmaṇa ("of a hundred paths") 9.2.2.4

9.2.2.4

yadvevaitā āhutīrjuhoti | etadvā enaṃ devā eṣyanta purastādannena samaskurvannetābhirāhutibhistathaivainamayametadeṣyantam purastādannena saṃskarotyetābhirāhutibhiḥ

And; again, as to why he offers those oblations;--now that he (Agni) was about to go forward, the gods restored (recruited) him beforehand with food, with these oblations; and in like manner does this (Sacrificer), now that he (Agni) is about to go forward, restore him beforehand with food, with these oblations.