Whomever Is Cursed, Reviled Or Prayed Against By The Prophet (SAW) When He Does Not Deserve That, It Will Be Purification, Reward And Mercy For Him Sahih Muslim 2604 a

Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى الْعَنَزِيُّ، ح وَحَدَّثَنَا ابْنُ بَشَّارٍ، - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا أُمَيَّةُ بْنُ خَالِدٍ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي حَمْزَةَ الْقَصَّابِ، عَنِ ابْنِ عَبَّاسٍ، قَالَكُنْتُ أَلْعَبُ مَعَ الصِّبْيَانِ فَجَاءَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَتَوَارَيْتُ خَلْفَ بَابٍ - قَالَ - فَجَاءَ فَحَطَأَنِي حَطْأَةً وَقَالَ ‏"‏ اذْهَبْ وَادْعُ لِي مُعَاوِيَةَ ‏"‏ ‏.‏ قَالَ فَجِئْتُ فَقُلْتُ هُوَ يَأْكُلُ - قَالَ - ثُمَّ قَالَ لِيَ ‏"‏ اذْهَبْ وَادْعُ لِي مُعَاوِيَةَ ‏"‏ ‏.‏ قَالَ فَجِئْتُ فَقُلْتُ هُوَ يَأْكُلُ فَقَالَ ‏"‏ لاَ أَشْبَعَ اللَّهُ بَطْنَهُ ‏"‏ ‏.‏ قَالَ ابْنُ الْمُثَنَّى قُلْتُ لأُمَيَّةَ مَا حَطَأَنِي قَالَ قَفَدَنِي قَفْدَةً ‏.‏
Translation
Ibn Abbas reported

I was playing with children that Allah's Messenger (ﷺ) happened to pass by (us). I hid myself behind the door. He (the Prophet) came and patted 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'awiya 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."