Śatapatha Brāhmaṇa ("of a hundred paths") 1.5.1.4

1.5.1.4

sa āśrāvya | ya eva devānāṃ hotā tamevāgre pravṛṇite 'gnimeva tadagnaye caivaitaddevebhyaśca nihnute yadahāgre 'gnim pravṛṇīte tadagnaye nihnute 'tha yo devānāṃ hotā tamagre pravṛṇīte tadudevebhyo nihnute

Having uttered the call, he in the first place chooses him who is the Hotri of the gods, that is, Agni. Thereby he propitiates both Agni and the gods: for by first choosing Agni, he propitiates Agni; and by first choosing him who is the Hotri of the gods, he propitiates the gods.