Śatapatha Brāhmaṇa ("of a hundred paths") 2.6.2.6

2.6.2.6

te vā aktāḥ syuḥ | aktaṃ hi havista u vā anaktā eva syurabhimānuko ha rudraḥ paśūntsyādyadañjyāttasmādanaktā eva syuḥ

They (the cakes) may be anointed (with ghee),--for the havis is anointed;--but let them rather be unanointed; for, indeed, Rudra would be hankering after the (sacrificer's) cattle, if he were to anoint (the cakes): let them therefore be unanointed.