Rashi on Deuteronomy 6:19/רש"י על דברים ו׳:י״ט

1כאשר דבר [TO THRUST OUT ALL THINE ENEMIES] AS [THE LORD] HATH SAID — And where did He promise this? When He said, (Exodus 23:27) “And I will confound all the peoples, etc." (Mekhilta).