Śatapatha Brāhmaṇa ("of a hundred paths") 1.7.3.21

1.7.3.21

sa vā abhyardha ivetarābhya āhutibhyo juhoti | itarā āhutīḥ paśavo 'nuprajāyante rudriyaḥ sviṣṭakṛdrudriyeṇa paśūnprasajedyaditarābhirāhutibhiḥ saṃsṛjette 'sya gṛhāḥ paśava upamūryamāṇā īyustasmādabhyardha ivetarābhya āhutibhyo juhoti

He offers on this side (in front), as it were, of the other oblations. Following the other oblations cattle are produced, and the Svishtakrit represents Rudra's power: he would impose Rudra's power on the cattle if he were to bring it (the Svishtakrit) into contact with the other oblations; and his (the sacrificer's) household and cattle would be destroyed. For this reason he offers on this side, as it were, of the other oblations.