tasyām pavitraṃ karoti / vasoḥ pavitramasīti yajño vai vasustasmādāha vasoḥ pavitramasīti //
On it he fastens a strainer (pavitram) , withthe formula , 'Vasu's means of purification (ventilator, strainer, pavitram) art thou!' Vasu, indeed, is the sacrifice: for this reason he says, 'Vasu's means of purification art thou!'