Rashi on Leviticus 26:32/רש"י על ויקרא כ״ו:ל״ב

1והשמתי אני את הארץ AND I WILL BRING THE LAND INTO DESOLATION [AND YOUR ENEMIES WHO ABIDE IN IT SHALL BE DESOLATE UPON IT] — This was a kindly measure for Israel that the enemies would find no satisfaction in their (the Israelites') land and so it would become desolate of its inhabitants (of the enemies also, and Israel might again easily take possession of it) (Sifra, Bechukotai, Chapter 6 5).