Śatapatha Brāhmaṇa ("of a hundred paths") 1.2.3.3

1.2.3.3

ta u haita ūcuḥ | upaivema eno gacantu ye 'sya badhyasyāvediṣuriti kimiti yajña evaiṣu mṛṣṭāmiti tadeṣvetadyajñomṛṣṭe yadebhyaḥ pātrīnirṇejanamaṅgulipraṇejanaṃ ninayanti

And the people thereupon said: 'Let those be guilty of the sin who knew about his going to be killed! 'How?' they asked. 'The sacrifice shall wipe it off upon (shall transfer it to) them!' they said. Hence the sacrifice thereby wipes off upon them (the guilt or impurity incurred in the preparation of the offering), when they pour out for them the water with which the dish has been rinsed, and that in which he (the Adhvaryu) has washed his fingers.