Śatapatha Brāhmaṇa ("of a hundred paths") 14.2.2.18

14.2.2.18

svāhāgnaye yajñiyāyeti tatsviṣṭakṛdbhājanamagnirhi sviṣṭakṛcaṃ yajurbhya iti yajurbhirhyeṣo'smiṃloke pratiṣṭhitastānyevaitatprīṇātyavaraṃ svāhākāraṃ karoti parāṃ devatāmasāveva bandhuḥ

With, 'Hail to Agni, worthy of sacrifice!'--this is in lieu of the Svishtakrit (offering), for Agni is the maker of good offering;--'may blessing result from the sacrificial texts!' for by the sacrificial texts that (sun) is established (as the Mahâvîra) in this world: thus it is them he thereby pleases. The call of 'hail!' he places first, and the deity last: the significance of this is the same as before.