Teshuvot Maharam, Prague Edition
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קנ. ראובן ושמען שהיולהם חוב בשותפות ואחר זמן נתן ראובן חלקו לשמעון ונסתלק אינו יכול להקנות שהבריא שאמר [הלואתי] לפלוני [אין] הלואתו לפלוני אפי' בקנןי אגב קרקע אלא במעמד שלשתן והא לא שייך בגוי ואין להאריך וא"כ של שמען חצי הריוח.
Q. A and B lent money on interest in partnership. Subsequently, A withdrew from the partnership and gave his part of the loan to B. Is this transaction valid? A. A healthy person can assign his loans to another only in the presence of all three interested parties, viz: the assignor, the assignee, and the debtor. This mode of assignment is valid only if the interested parties are Jews. Since in this case the debtor was a Gentile, the assignment of the loan was not valid and the accrued interest belongs to A. SOURCES: Cr. 61; Pr. 150; L. 376.