174 Yevamot 15/7

(7) [If] a woman said, "My husband died and then my father-in-law died", she may marry and collect her Ketubah, but her mother-in-law is forbidden [to marry]. If she [the mother-in-law] was the daughter of an Israelite [married] to a priest she may eat Terumah, these are the words of Rabbi Tarfon. Rabbi Akiva says: This is not the way to prevent her from sin, rather she is forbidden to marry and forbidden to eat Terumah. [If] an individual betrothed one of five women but does not know which [of them] he betrothed, [and] each one says, "He betrothed me" - he gives a bill of divorce to each one, and places [the value of] a Ketubah among them and bolts, these are the words of Rabbi Tarfon. Rabbi Akiva says: This is not the way to prevent him from sin, rather he must give a bill of divorce and a Ketubah to each one. [If] an individual stole from one of five people but does not know from which [of them] he stole, [and] each one says, "He robbed me" - he places the stolen object among them and bolts, these are the words of Rabbi Tarfon. Rabbi Akiva says: This is not the way to prevent him from sin, rather he must pay [the value of] the stolen object to each one.