Quran 3:166 — The Amramites (Ali-'Imran)

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

[3:165] 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.

[3:167] And to expose the hypocrites who were told, "Come fight in the cause of GOD, or contribute." They said, "If we knew how to fight, we would have joined you." They were closer to disbelief then than they were to belief. They uttered with their mouths what was not in their hearts. GOD knows what they conceal.