Sforno on Leviticus 25:11/ספורנו על ויקרא כ״ה:י״א

1יובל היא שנת החמישים שנה תהיה לכם, just as the soil will become free from those who have purchased it, it will not be enslaved to the owners that are returning to it; during that year they must not yet use it as if it were their own.