Jami` at-Tirmidhi 1982
جامع الترمذي#1982SahihAl-Mughirah bin Shu'bah narrated that the Messenger of Allah said:"Do not vilify the dead (and) by that harm the living
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
Zubair Ali ZaiHasan
In-book reference: 27:88