Jami` at-Tirmidhi, Volume 4, Book 25, Hadith 1981 (DarusSalam) ⓘ
'Abu Hurairah narrated that the Messenger of Allah said: "(The burden of) what is said by the two who vilify each other is upon the one who initiated it, as long as the one who was wronged does not transgress."
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ، عَنِ الْعَلاَءِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " الْمُسْتَبَّانِ مَا قَالاَ فَعَلَى الْبَادِي مِنْهُمَا مَا لَمْ يَعْتَدِ الْمَظْلُومُ " . وَفِي الْبَابِ عَنْ سَعْدٍ وَابْنِ مَسْعُودٍ وَعَبْدِ اللَّهِ بْنِ مُغَفَّلٍ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
also referenced under: Hadith 1981 (Reference) & Book 27, Hadith 87 (In-Book)