Aal-i-Imraan 3:165

How is it that, when you suffered a calamity[78] [at ’Uhud] while you had inflicted twice as much upon them[79] [at Badr], you said, “How could this happen?” Say, “You brought this to yourselves. Indeed, Allah is Most Capable of all things.”

[78] Seventy Muslims were killed.
[79] Seventy of the enemy were killed and seventy were taken as captives.

Why [is it that] when a [single] disaster struck you [on the day of Uḥud], although you had struck [the enemy in the battle of Badr] with one twice as great, you said, "From where is this?" Say, "It is from yourselves [i.e., due to your sin]." Indeed, Allāh is over all things competent.

165. (What is the matter with you?) When a single disaster smites you, although you smote (your enemies) with one twice as great, you say: "From where does this come to us?" Say (to them), "It is from yourselves (because of your evil deeds)." And Allâh has power over all things.

And was it so, when a disaster smote you, though ye had smitten (them with a disaster) twice (as great), that ye said: How is this? Say (unto them, O Muhammad): It is from yourselves. Lo! Allah is Able to do all things.