The Book of the Believer · Hadith 186 (#Ḥadīth #16)
Chapter 8 | What Allah (azwj) has Forbidden a Believer to do Against a Fellow Believer
186 - وعن أبي عبد الله عليه السلام أنه قال: نزل جبرئيل على النبي صلى الله عليه وآله وسلم، وقال له: يا محمد إن ربك يقول: من أهان عبدي المؤمن فقد استقبلني بالمحاربة.
186. It has been narrated that Abu 'Abd Allah said that Archangel Gabriel descended to the Prophet and said, 'O Muhammad, your Lord says: Whoever disgraces My believing servant has in fact confronted Me with war.'
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).