Narrated 'Abdullah (Radi-Allahu 'anhu): The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "Abusing a Muslim is Fusuq...
Narrated 'Abdullah (Radi-Allahu 'anhu):
The Prophet (Sallallahu 'Alaihi Wa Sallam) said,"Abusing a Muslim is Fusuq
(evil doing) and killing him is Kufr (disbelief)."
Bukhari Vol. 9 : No. 197