Śatapatha Brāhmaṇa ("of a hundred paths") 2.2.1.2

2.2.1.2

sa etenānnena śāntaḥ | uttarāṇi havīṃṣi śrapyamāṇānyuparamati śaśvaddha vā adhvaryuṃ vā yajamānaṃ vā pradahettau hyasya nediṣṭhaṃ carato yadasminnetāmāhutiṃ na juhuyāttasmādvā etāmāhutiṃ juhoti

And having been appeased by that food, he (Agni) waits patiently for the other oblations to be cooked. If, on the other hand, that oblation were not to be offered up in him, he would ere long burn either the Adhvaryu or the sacrificer, for these two pass nearest by him. This is the reason why he makes this offering.