Shatapatha Brahmana 3.7.4.10

3.7.4.10

atha dvitīyamāśrāvayati | dvau hyatra hotārau bhavataḥ sa maitrāvaruṇāyāhaivāśrāvayati yajamānaṃ tveva pravṛṇīte 'gnirha daivīnāṃ viśām puraetetyagnirhi devatānām mukhaṃ tasmādāhāgnirha daivīnāṃ viśām puraetetyayaṃ yajamāno manuṣyāṇāmiti taṃ hi so 'nvardho bhavati yasminnardhe yajate tasmādāhāyaṃ yajamāno manuṣyāṇāmiti tayorasthūri gārhapatyaṃ dīdayacataṃ himā dvā yū iti tayoranārtāni gārhapatyāni śataṃ varṣāṇi santvityevaitadāha

Thereupon he calls a second time for the Sraushat, for on this occasion there are two Hotris it is with regard to the Maitrâvaruna that he now calls for the Sraushat. But it is the sacrificer whom he chooses, saying, 'Verily, Agni is the leader of the divine hosts,' for Agni is the head of the deities; wherefore he says, 'Verily, Agni is the leader of the divine hosts;'--'this sacrificer of the human;' for that community wherein he sacrifices is behind (inferior to) him; wherefore he says, 'This sacrificer (is the head) of the human.' 'May the household of these two shine brightly, not (like a cart yoked) with one bullock, for a hundred winters,--two yoke-fellows!' whereby he means to say, 'May their household matters be free from calamities for a hundred years.'