Rashi on Deuteronomy 13:18/רש"י על דברים י״ג:י״ח

1למען ישוב ה' מחרון אף THAT THE LORD MAY TURN FROM THE FIERCENESS OF HIS WRATH — for as long as idol-worship exists in the world the fierce wrath of God is kindled against the world (Sifrei Devarim 96:3; Sanhedrin 111b; cf. Rashi on Genesis 9:32).