Shatapatha Brahmana 1.5.1.15

1.5.1.15

tatra japati etatattvā deva savitarvṛṇata iti tatsavitāram prasavāyopadhāvati sa hi devānām prasavitāgniṃ hotrāyeti tadagnaye caivaitaddevebhyaśca nihnute yadahāgre 'gnimāha tadagnaye nihnute 'tha yo devānāṃ hotā tamagra āha tadu devebhyo nihnute

He mutters on this occasion, 'Thee, O divine Savitri, they now choose,'--thereby he has recourse to Savitri for his impulsion (prasava), for Savitri is the impeller (prasavitri) of the gods;--'(thee who art) Agni, for the Hotriship,' thereby he propitiates both Agni and the gods; for by first naming Agni, he propitiates Agni; and by first naming him who is the Hotri of the gods, he propitiates the gods.