Śatapatha Brāhmaṇa ("of a hundred paths") 2.6.1.30

2.6.1.30

athāhāgnaye kavyavāhanāyānubrūhīti | tatsviṣṭakṛte havyavāhano vai devānāṃ kavyavāhanaḥ pitṝṇāṃ tasmādāhāgnaye kavyavāhanāyānubrūhīti

Thereupon he says, 'Pronounce the invitatory prayer to Agni Kavyavâhana!' that being for (Agni as) the Svishtakrit ('maker of good offering'). For to the gods indeed he is havyavâhana ('bearer of oblations'), and to the fathers he is kavyavâhana ('the bearer of what is meet for the wise'): hence he says, 'Pronounce the invitatory prayer to Agni Kavyavâhana!'