תלמוד על כתובות 12:2

MISHNAH: One cannot collect for usufruct⁴⁷If a robber took land by force, had its use for some time, and then sold it, the land itself can be reclaimed from the buyer but payment for the illicit use of the land can be exacted only from the robber himself., for improvement of the land⁴⁸If the buyer of some property makes improvements, such as planting fruit trees, and then loses the property through the foreclosure of a prior lien, he can recoup his expenses for the improvements only from the original seller directly., or for sustenance of the wife and the daughters⁴⁹It is a required condition in a ketubah that after the husband’s death his widow and unmarried daughters be sustained by the estate (Ketubot 4:11–12). While the ketubah itself is a mortgage lien on all real estate acquired by the husband, the additional conditions cannot be foreclosed as a mortgage. from incumbered property, for the public good⁵⁰All other Mishnah sources have an additional clause, either as original text or addition: “The finder shall not be made to swear, for the public good.” Since the statement is quoted in the Halakhah (Note 88), it should be read here also..