Surah Ali 'Imran 3:165

أَوَلَمَّآ أَصَـٰبَتْكُم مُّصِيبَةٌ قَدْ أَصَبْتُم مِّثْلَيْهَا قُلْتُمْ أَنَّىٰ هَـٰذَا ۖ قُلْ هُوَ مِنْ عِندِ أَنفُسِكُمْ ۗ إِنَّ ٱللَّهَ عَلَىٰ كُلِّ شَىْءٍ قَدِيرٌ

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.

Translation: Saheeh International

Tafsir

And why when distress befell you at Uhud when seventy of you were slain and you had afflicted twice the like of it at Badr slaying seventy of them and taking another seventy captive did you say in amazement ‘How is this?’ that is how did this defeat happen to us when we are Muslims and God’s Messenger is among us the …

Excerpt from Tafsir al-Jalalayn, commentary on 3:165, via Quran.com. The reader has the full commentary and 9 more tafsirs.