(47) باب الْمُسْتَبَّانِ
Abu Hurairah reported the Messenger of Allah (May peace be upon him) 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.
Reference: Sunan Abi Dawud 4894
In-book reference: Book 43, Hadith 122
English translation: Book 42, Hadith 4876