Mishnayos Gittin Perek 5 Mishnah 3

The court does not appropriate liened property that has been sold to a third party for the consumption of produce or for the enhanced value of land. If one appropriated a field and sold it, and the buyer worked the land, enhanced it, and grew produce on it, and then the initial owner from whom the field had been stolen took back the land and the produce from the buyer, compensating him only for his expenses, then the buyer may go back to the seller, i.e., the robber, and collect his losses. He can collect the purchase price of the field even from property that the robber sold to another person. By contrast, the value of the produce and the enhancement in the value of the field, which resulted from his actions, may be collected only from the robber’s unsold property. And similarly, payment for the sustenance of a man’s wife and daughters cannot be collected from his liened property. One of the stipulations included in a marriage contract is that after the husband dies, his widow and daughters are entitled to sustenance from his estate. This sustenance cannot be collected from husband’s liened property that has been sold to another person, but only from his unsold property inherited by his heirs. All of these enactments were made for the betterment of the world. And it was further instituted that one who finds a lost item and returns it to its rightful owner is not required to take an oath that he did not keep any part of the lost item for himself. This ordinance was also instituted for the betterment of the world.

אֵין מוֹצִיאִין לַאֲכִילַת פֵּרוֹת וּלְשֶׁבַח קַרְקָעוֹת וְלִמְזוֹן הָאִשָּׁה וְהַבָּנוֹת מִנְּכָסִים מְשֻׁעְבָּדִים, מִפְּנֵי תִקּוּן הָעוֹלָם. וְהַמּוֹצֵא מְצִיאָה, לֹא יִשָּׁבַע, מִפְּנֵי תִקּוּן הָעוֹלָם: