Shatapatha Brahmana 5.5.4.19

5.5.4.19

tadu tathā na kuryāt | ulkayā ha sa nakhinyā paśūnanuṣuvati ya etāni paśuṣvāvapati tasmādu parisrutyevāvapettathā holkayā nakhinyā paśūnnānuṣuvati tatho evainaṃ samardhayati kṛtsnaṃ karoti tasmādu parisrutyevāvapeta

But let him not do it so; for he who throws them on the (portions of) the victims, urges the animals on from behind with a clawed (prickly) fire-brand. Let him therefore rather throw them into the fermented liquor (parisrut),--thus he does not urge on the animals from behind with a clawed fire-brand; and thus alone he supplies him therewith, and makes him whole: let him therefore throw it rather into the spirituous liquor.