Shatapatha Brahmana 1.7.1.16

1.7.1.16

tadānīyamānamabhimantrayate | devastvā savitā punātu vasoḥ pavitreṇa śatadhāreṇa supveti tadyathaivādaḥ somaṃ rājānam pavitreṇa sampāvayantyevamevaitatsampāvayati

When it (the milk of each of the three cows) is poured (by the milker from the wooden pail through the strainer into the pot), he (the Adhvaryu) consecrates it by (whispering each time) the formula (Vâg. S. I, 3 b), 'May the divine Savitri purify thee with Vasu's means of purification, well cleansing and flowing in a hundred streams!' for just as then (at the Soma-sacrifice) they clarify king Soma with a strainer, so he thereby clarifies (the milk).