Shatapatha Brahmana 5.1.1.16

5.1.1.16

tasmādāha | deva savitaḥ prasuva yajñam prasuva yajñapatim bhagāya divyo gandharvaḥ ketapūḥ ketaṃ naḥ punātu vācaspatirvājaṃ naḥ svadatu svāheti prajāpatirvai vācaspatirannaṃ vājaḥ prajāpatirna idamadyānnaṃ svadatvityevaitadāha sa etāmevāhutiṃ juhotyā śvaḥsutyāyā etaddhyasyaitatkarmārabdham bhavati prasanna etaṃ yajñam bhavati

Wherefore he says (Vâg. S. IX, 1), 'God Savitri, speed the sacrifice, speed the lord of sacrifice unto his portion! May the heavenly. thought-cleansing Gandharva cleanse our thought! May the Lord of Speech render our meat palatable, hail!' For the Lord of Speech is Pragâpati, and meat means food: 'May Pragâpati this day make palatable this our food!' thus he thereby says. This same oblation he offers till the day before the Soma-feast, for thus that performance of his has been commenced; and he (Savitri, the Sun) becomes serene during that sacrifice.