Atharva Veda 19.59

For successful sacrifice

Thou, O Agni, art protector of vows among gods (?), among mortals; thou art to be praised at the sacrifices.

If we, O gods, detract from (pra-mī) your [ordained] courses—we that are very unknowing, of you that are knowing—let Agni the all-devouring fill that up, knowing, and the soma that has entered the Brahmans.

We have come unto the road of the gods, to convey (vah) along forward what we may be able; Agni [is] knowing; he shall make offering; he verily is hótar; he shall arrange the sacrifices (adhvará), he the seasons.