פירוש על דברי הימים א 28:17

and for the basins of gold in weight Heb. כְּפוֹרֵי כְּפוֹרֵי. [They] are service vessels with which to wipe the blood from the vessels, and an example is in the first (sic) chapter of Baba Mezia (24a): “The man who wiped (דְּכָפַר) his hands with his neighbor’s cloak,” and every [expression of] כַּפָּרָה is an expression of wiping and purification.