Shatapatha Brahmana 7.5.2.28

7.5.2.28

athotsargairupatiṣṭhata | etadvai yatraitānprajāpatiḥ paśūnālipsata ta ālipsyamānā aśocaṃsteṣāmetairutsargaiḥ śucam pāpmānamapāhaṃstathaivaiṣāmayametadetairutsargaiḥ śucam pāpmānamapahanti

He then stands by (the heads, revering them) with the Utsargas. For at that time when Pragâpati wanted to slaughter the victims, they, being about to be slaughtered, were distressed (or pained); and by these Utsargas he drove out their distress, their evil. In like manner does this one, by these Utsargas, now drive out their distress, their evil.