Sahih Muslim Book 32, Hadith Number 6298.

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.

Ibn Abbas reported: I was playing with children that Allah’s Messenger (may peace be upon him) happened to pass by (us). I hid myself behind the door. He (the Holy Prophet) came and he patted upon my shoulders and said: Go and call Mu’awiya. I returned and said: He is busy in taking food. He again asked me to go and call Mu’swiya to him. I went (and came back) and said that he was busy in taking food, whereupon he said: May Allah not fill his belly! Ibn Muthanna, said: I asked Umm Umayya what he meant by the word Hatani. He said: It means “he patted my shoulders”.