Quran 8:44 — The Spoils of War (Al-Anfal)

And when the time came and you faced them, He made them appear fewer in your eyes, and made you appear fewer in their eyes as well. For GOD willed to carry out a certain plan. All decisions are made by GOD.

[8:43] GOD made them appear in your dream (O Muhammad) fewer in number. Had He made them appear more numerous, you would have failed, and you would have disputed among yourselves. But GOD saved the situation. He is Knower of the innermost thoughts.

[8:45] O you who believe, when you encounter an army, you shall hold fast and commemorate GOD frequently, that you may succeed.