Ali 'Imran 3:165

أَوَلَمَّآ أَصَٰبَتۡكُم مُّصِيبَةٞ قَدۡ أَصَبۡتُم مِّثۡلَيۡهَا قُلۡتُمۡ أَنَّىٰ هَٰذَاۖ قُلۡ هُوَ مِنۡ عِندِ أَنفُسِكُمۡۗ إِنَّ ٱللَّهَ عَلَىٰ كُلِّ شَيۡءٖ قَدِيرٞ 165

Why [is it that] when a [single] disaster struck you [on the day of Uhud], 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." Indeed, Allah is over all things competent