Surah Ali'Imran, Verse 165

أَوَلَمَّآ أَصَٰبَتۡكُم مُّصِيبَةٞ قَدۡ أَصَبۡتُم مِّثۡلَيۡهَا قُلۡتُمۡ أَنَّىٰ هَٰذَاۖ قُلۡ هُوَ مِنۡ عِندِ أَنفُسِكُمۡۗ إِنَّ ٱللَّهَ عَلَىٰ كُلِّ شَيۡءٖ قَدِيرٞ١٦٥

awalammā aṣābatkum muṣībatun qad aṣabtum mith'layhā qul'tum annā hādhā qul huwa min ʿindi anfusikum inna l-laha ʿalā kulli shayin qadīrun

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.