Surah Aal-E-Imran Ayahs #169 Translated in English

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.

And what struck you on the day the two armies met [at Uḥud] was by permission of Allāh that He might make evident the [true] believers

And that He might make evident those who are hypocrites. For it was said to them, "Come, fight in the way of Allāh or [at least] defend." They said, "If we had known [there would be] battle, we would have followed you." They were nearer to disbelief that day than to faith, saying with their mouths what was not in their hearts. And Allāh is most knowing of what they conceal -

Those who said about their brothers while sitting [at home], "If they had obeyed us, they would not have been killed." Say, "Then prevent death from yourselves, if you should be truthful."

And never think of those who have been killed in the cause of Allāh as dead. Rather, they are alive with their Lord, receiving provision,