Rashi on Numbers 18:20/רש"י על במדבר י״ח:כ׳

1וחלק לא יהיה לך בתוכם [THOU SHALT NOT INHERIT THEIR LAND,] NEITHER SHALT THOU HAVE ANY PORTION IN THE MIDST OF THEM even in the spoil (Sifrei Bamidbar 119:1).