Sahih Muslim , Book 45, Hadith 111 (In-Book) ⓘ
Abu Huraira reported it was said to Allah's Messenger: Invoke curse upon the polytheists, whereupon he said: I have not been sent as the invoker of curse, but I have been sent as mercy."
حَدَّثَنَا مُحَمَّدُ بْنُ عَبَّادٍ، وَابْنُ أَبِي عُمَرَ، قَالاَ حَدَّثَنَا مَرْوَانُ، - يَعْنِيَانِ الْفَزَارِيَّ - عَنْ يَزِيدَ، - وَهُوَ ابْنُ كَيْسَانَ - عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قِيلَ يَا رَسُولَ اللَّهِ ادْعُ عَلَى الْمُشْرِكِينَ قَالَ " إِنِّي لَمْ أُبْعَثْ لَعَّانًا وَإِنَّمَا بُعِثْتُ رَحْمَةً " .
also referenced under: Hadith 2599 (Reference) & Book 32, Hadith 6284 (USC-MSA)