Sahih Muslim Book 32, Hadith Number 6294.

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 that he heard Allah’s Messenger (may peace be upon him) as saying: O Allah, for any believing servant whom I curse make that as a source of nearness to Thee on the Day of Resurrection.