Shatapatha Brahmana 11.4.2.13

11.4.2.13

athāto homasya taddhaitadeke kuśalā manyamānāḥ prācīṃ srucamupāvahṛtya hutvā paryāhṛtyopabhṛtyadhinidadhati na tathā kuryādyo hainaṃ tatra brūyādanuyuvaṃ nvā ayamadhvaryuryajamānamakaddviṣato bhrātṛvyasyānvavasāyinamitīśvaro ha tathaiva syāt

Now as to the oblation. In this respect, some people, thinking themselves clever, having turned down the spoon eastwards, and poured out the oblation, turn it round and place it over the upabhrit. But let him not do this; for if, in that case, any one were to say of him, 'Surely, this Adhvaryu has made the Sacrificer dependent on, and submissive to, his spiteful enemy,' then that would indeed be likely to come to pass.