Footnotes
1.
In the days of Joshua, Israel was divided up among the various tribes, excluding Levi. The Rambam, Hilchos Shemittah VeYovel, 13:11, holds that the prohibition only covers the portion of Israel promised to Avraham, Yitzchak and Yaakov. They may, however, take a portion of additional lands captured in the past by various Jewish kings.
2.
Deut. 18:1.