For the source text click/tap here: Bava Kamma 108
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The Gemara questions the mishna’s ruling that one who robs his father must return the stolen item to others even if he is the sole heir. Why must he do this? Let him forgive the debt to himself; as the heir, to whom payment is due, he should be able to forgive it.
Rabbi Yoḥanan explains: It is taught in a baraita (Tosefta 10:16) that the verse (Num 5:8) states with regard to one who steals from one who then died:
וְאִם־אֵ֨ין לָאִ֜ישׁ גֹּאֵ֗ל לְהָשִׁ֤יב הָאָשָׁם֙ אֵלָ֔יו הָאָשָׁ֛ם הַמּוּשָׁ֥ב לַיהֹוָ֖ה לַכֹּהֵ֑ן מִלְּבַ֗ד אֵ֚יל הַכִּפֻּרִ֔ים אֲשֶׁ֥ר יְכַפֶּר־בּ֖וֹ עָלָֽיו׃
If that party [is deceased and] has no kin to whom restitution can be made, the amount repaid shall go to יהוה for the priest—in addition to the ram of expiation with which expiation is made on their behalf.
The baraita asks: But is there any Jewish person who has no kinsmen?
Since every Jew descends from Jacob our forefather, all Jews have relatives to inherit from them.
Rather, it must be that the verse is speaking of robbery of a convert.
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