'O God, I have obtained one promise from You. And on no account will You go against it. After all, I am a human being. (If ever) I have harmed a Muslim, or have spoken ill of him, or cursed him, or flogged him, then in compensation for all this, give him Your blessings, Your purity and Your nearness.'
HADITH OF AL-BUKHARI AND MUSLIM
On the Authority of Abu Hurayrah