The Book of the Believer · Hadith 98 (#Ḥadīth #6)
Chapter 4 | The Rights of a Believer on a Fellow Believer.
98 - وعن أبي عبد الله (ع) قال: قال النبي (ص) المُسلمُ أخو المسلمِ لا يخونُه ولا يخذِلُه ولا يعيبُه ولا يحرمُه ولا يغتابُه.
98. It has been reported that Abu 'Abd Allah said: The Prophet said: A Muslim is a brother to the other Muslim; he must not betray him, desert him, disgrace him, excommunicate him nor backbite him.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).