Sahih Muslim Book 32, Hadith Number 6296.

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.

Jabir b. Abdullah reported Allah’s Messenger (may peace be upon him) as saying: I am a human being and I have made this term with my Lord, the Exalted and Glorious: For any servant amongst Muslims whom I curse or scold, make that a source of purity and reward. This hadith has been narrated on the authority of Ibn Juraij with the same chain of transmitters.