Abu Hurairah reported the Messenger of Allah ﷺ as saying: when two men abuse one another, what they say is laid to the charge of the one who began it, so long as the one who is wronged does not go over the score.
Hadith Referenceسنن ابي داود / كتاب الأدب / 4894
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم (2587)