YV 6.1h

Thus he announces the sacrifice to the gods and sacrifices, and the gods delight in his sacrifice. This is the taking of the sacrifice and so after taking the sacrifice he sacrifices. After speaking he remains silent, to support the sacrifice. Now Prajapati performed the sacrifice with mind; verily he performs the sacrifice with mind to prevent the Raksases following. He who yokes the sacrifice when the yoking (time) arrives yokes it indeed among the yokers. 'Who (ka) yoketh thee? Let him yoke thee', he says. Ka is Prajapati--verily by Prajapati he yokes it; he yokes indeed among the yokers. Prajapati created the sacrifices, the Agnihotra, the Agnistoma, the full moon sacrifice, the Ukthya, the new moon sacrifice and the Atiratra. These he meted out; the Agnistoma was the size of the Agnihotra, the Ukthya that of the full moon sacrifice, the Atiratra that of the new moon sacrifice. He who knowing thus offers the Agnihotra obtains as much as by offering the Agnistoma; he who knowing thus offers the full moon sacrifice obtains as much as by offering the Ukthya [1]; he who knowing thus offers the new moon sacrifice obtains as much as by offering the Atiratra. This sacrifice was in the beginning Paramesthin's, and by means of it he reached the supreme goal. He furnished Prajapati with it, and by means of it Prajapati reached the supreme goal. He furnished Indra with it, and by means of it Indra reached the supreme goal. He furnished Agni and Soma with it, and by means of it Agni and Soma reached the supreme goal. He who [2] knowing thus offers the new and full moon sacrifices reaches the supreme goal. He who sacrifices with an abundant offering is multiplied with offspring, with cattle, with pairings. 'The year has twelve months, there are twelve pairs of new and full moon sacrifices; these are to be produced', they say.