The Book of the Believer · Hadith 185 (#Ḥadīth #15)
Chapter 8 | What Allah (azwj) has Forbidden a Believer to do Against a Fellow Believer
185 - وعن المعلي بن خنيس قال: سمعته يقول: إن الله عز وجل يقول: من أهان لي وليا فقد ارصد لمحاربتي، و أنا أسرع شئ إلى نصرة أوليائي.
185. It has been narrated that al-Mu'alla ibn Khunays said: I heard al-Sadiq saying: Most surely, Allah [M.G] has declared: One who humiliates a friend of Mine has prepared for battle against Me; and I am the swiftest of all in coming to My friends' rescue.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).