The beam of a balance scale and a level that have a receptacle for [holding] metal, a carrying-pole that has a receptacle for [holding] money, a pauper’s cane that has a receptacle for [holding] water, a stick that has a receptacle for [holding] a mezuzah and pearls, these are tamei. Regarding [the law of] all of these [utensils], Rabban Yochanan ben Zakkai said: Woe to me if I say it, and woe to me if I do not say it.