Jami` at-Tirmidhi 1981
جامع الترمذي#1981SahihAbu 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 27:87