All those required by the Torah to swear —-swear and do not pay. But the following swear and collect: the hired laborer, the one who was robbed, the one who was wounded, the one whose opponent is not trusted to swear, and the storekeeper over his account book. The hired laborer, how so? [If] he says to him, “Give me my wages which are in your possession,” [and] he replies, “I gave [them to you],” but this one says, “I did not receive [them]” —- he swears and collects. R' Yehudah says: Only if there is a partial admission. How so? He says to him, “Give me my wages of fifty dinars which are in your possession,” while he replies, “You have [already] received a gold dinar.''