Abdullah bin Mas'ud narrated that the Messenger of Allah said:
"Verbally abusing the Muslim is disobedience and fighting him is disbelief." Zubaid said:"I said to Abu Wa'il: 'Did you hear it from 'Abdullah?' He said: 'Yes.'"
Reference: Jami` at-Tirmidhi 1983 In-book : Book 27, Hadith 89 English translation : Vol. 4, Book 1, Hadith 1983
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