YV 3.6n

The speckled butter is the expiration and inspiration of cattle, the omentum is the body; having poured butter on the speckled ghee,' he pours on the omentum; verily in the body of cattle he deposits expiration and inspiration. 'Hail! Go to Urdhvanabhas, the offspring of the Maruts', he says; Urdhvanabhas, the offspring of the Maruts, used to cast forward the omentum- forks of the gods; verily through him he casts them forward. He casts them forward in opposite directions; therefore expiration and inspiration are in opposite directions. Having offered in sacrifice the beast, he strews over (it) a cake, verily he sacrifices it with its sap. Having performed the rite with the omentum, he performs with the cake; the cake is strength; verily he places strength in the midst of cattle; verily also he closes the cut in the beast. Having made offering of the speckled ghee, he thrice asks, 'Is the oblation cooked, Çamitr?' for the gods found truth in three (cookings). He who says what is not cooked is cooked (is burdened) with sin. The speckled butter is the expiration and the inspiration of cattle [1]; when the beast is offered the body comes into the heart; in that he sprinkles the heart with speckled ghee, he thus places expiration and inspiration in the body of cattle. By means of the beast the gods went to the world of heaven. They reflected, 'Men will mount after us.' They cut off its head and made its sap stream forth; it became the Praksa (tree); that is the nature of the Praksa. In that there is a branch of the Praksa above the strew, so he cuts off from the victim when it has its sap [2]. As the beast is borne along the Raksases follow after it; he takes it between the sacrificial post and the Ahavaniya, to smite away the Raksases. When the beast is offered its mind departs. 'Recite to Manota, for the oblation which is being divided', he says verily he secures its mind.