Quran 3:165 — The Amramites (Ali-'Imran)

Now that you have suffered a setback, and even though you inflicted twice as much suffering (upon your enemy), you said, "Why did this happen to us?" Say, "This is a consequence of your own deeds." GOD is Omnipotent.

[3:164] GOD has blessed the believers by raising in their midst a messenger from among them, to recite for them His revelations, and to purify them, and to teach them the scripture and wisdom. Before this, they had gone totally astray.

[3:166] What afflicted you the day the two armies clashed was in accordance with GOD's will, and to distinguish the believers.