Sforno on Leviticus 25:23/ספורנו על ויקרא כ״ה:כ״ג

1והארץ לא תמכר לצמיתות. The legislation applies to land intended for cultivation..

2כי לי הארץ, a reference that the region known as גליל, the earth is G’d’s. [specifically excluding the east bank of the Jordan, based on the letter ה in front of the word הארץ. Compare Torat Kohanim there. Ed.] כי גרים ותושבים אתם עמדי, in this very same גליל, which is not part of “He has given earth to man” (Psalms 115,16).