Shatapatha Brahmana 1.3.1.6

1.3.1.6

sa vā ityagrairantarataḥ sammārṣṭi | aniśito 'si sapatnakṣiditi yathānuparato yajamānasya sapatnānkṣiṇuyādevametadāha vājinaṃ tvā vājedhyāyai sammārjmīti yajñiyaṃ tvā yajñāya sammārjmītyevaitadāhaitenaiva sarvāḥ srucaḥ sammārṣṭi vājinīṃ tveti srucaṃ tūṣṇīm prāśitraharaṇaṃ

He brushes it thus inside with the (grass-)tops (cut off from the grass in tying the veda), with the text (Vâg. S. I, 29), 'Not sharp art thou, (but yet) a destroyer of the enemies!' he says this in order that it may unceasingly destroy the enemies of the sacrificer. Further, 'Thee, the food-abounding (masc.), I cleanse for the kindling of food!'--'thee that art suitable for the sacrifice, I cleanse for the sacrifice,' he thereby says. In the same way he brushes all the spoons, saying, 'Thee, the food-abounding (fem.)...,' in the case of the offering-spoon (sruk, fem.). The prâsitraharana (he brushes) silently.