Sahih Muslim Book 32, Hadith Number 6287.

Chapter : He upon whom Allah’s Apostle (may peace be upon him) invoked curse whereas he in fact did not deserve it, it would be a source of reward and mercy for him.

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: O Allah, I am a human being and for any person amongst Muslims upon whom I hurl malediction or invoke curse or give him whipping make it a source of purity and mercy.