Deuteronomy 32: 26 - 28, 30, 35 - 36
26 I would have said, "I will scatter them afar, I will make the remembrance of them cease from among men,"
27 had I not feared provocation by the enemy, lest their adversaries should judge amiss, lest they should say, "Our hand is triumphant, the LORD has not wrought all this."'
28 "For they are a nation void of counsel, and there is no understanding in them.
30 How should one chase a thousand, and two put ten thousand to flight, unless their Rock had sold them, and the LORD had given them up?
35 Vengeance is mine, and recompense, for the time when their foot shall slip; for the day of their calamity is at hand, and their doom comes swiftly.
36 For the LORD will vindicate his people and have compassion on his servants, when he sees that their power is gone, and there is none remaining, bond or free.

EWTN