Verse Quran
2:251 By Allah's will they routed them; and David slew Goliath; and Allah gave him power and wisdom and taught him whatever (else) He willed. And did not Allah Check one set of people by means of another, the earth would indeed be full of mischief: But Allah is full of bounty to all the worlds.
3:12 Say to those who reject Faith: "Soon will ye be vanquished and gathered together to Hell,-an evil bed indeed (to lie on)!
3:160 If Allah helps you, none can overcome you: If He forsakes you, who is there, after that, that can help you? in Allah, then, Let believers put their trust.
30:2 The Roman Empire has been defeated.
30:3 In a land close by; but they, (even) after (this) defeat of theirs, will soon be victorious.

The Quran's Verse about defeat

green, yathrib, food, poor, passenger, sculpt, weariness, comment, Jonah, heart pain, walking, Joseph, roll, weakness, victory, relativity of time, demon of hell, Zakariya, zanjabil, richness,