Sefer HaMitzvot, Negative Commandments
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הזהיר שלא למכור בארץ ישראל מכירה קיימת. והוא אמרו והארץ לא תמכר לצמיתות, והתבארו משפטי מצוה זו בערכין. (שם, שם פי"א):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited - not to sell our land in the Land of Israel [as a] permanent sale. And that is His saying, "The land shall not be sold in perpetuity" (Leviticus 25:23). And the regulations of this commandment have been explained in Arakhin. (See Parashat Behar; Mishneh Torah, Sabbatical Year and the Jubilee 11.)