Aal-'Imran - 3:165

أَوَلَمَّا أَصَابَتْكُم مُّصِيبَةٌ قَدْ أَصَبْتُم مِّثْلَيْهَا قُلْتُمْ أَنَّى هَـذَا قُلْ هُوَ مِنْ عِندِ أَنْفُسِكُمْ إِنَّ اللّهَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ
[3:165]
What! when a misfortune befell you, and you had certainly afflicted (the unbelievers) with twice as much, you began to say: Whence is this? Say: It is from yourselves; surely Allah has power over all things.
What! When a single disaster smites you, although ye smote (your enemies) with one twice as great, do ye say?- "Whence is this?" Say (to them): "It is from yourselves: For Allah hath 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.