Śatapatha Brāhmaṇa ("of a hundred paths") 1.3.1.8

1.3.1.8

sa vai sammṛjyasammṛjya pratapya pratapya prayacati | yathāvamarśaṃ nirṇijyānavamarśamuttamam parikṣālayedevaṃ tattasmātpratapya pratapya prayacati

Each time he has brushed and heated (a spoon), he hands it (to the Adhvaryu). Just as, after having rinsed (the eating vessels) while touching them, one would finally rinse them without touching them, so here: for this reason he hands over each (spoon) after heating it.