590 — Abū Bakr related to us; Jarīr related to us, from Mansūr, from Abū Khālid al-Wālibī, from al-Nuʿmān ibn Amr ibn Muqarrin, who said: The Messenger of Allah—may Allah bless him and grant him peace—said: “Reviling a Muslim is wickedness, and fighting him is disbelief.”