"I said to Hammad: 'I heard Mansur, and Sulaiman, and Zubaid narrating from Abu Wa'il, from 'Abdullah, that the Messenger of Allah (ﷺ) said: "Defaming a Muslim is evildoing and fighting him is Kufr." - Who are you worried about? Are you worried about Mansur? Are you worried about Zubaid? Are you worried about Sulaiman?' He said: 'No, but I am worried about Abu Wa'il.'"
Reference: Sunan an-Nasa'i 4109 In-book : Book 37, Hadith 144 English translation : Vol. 5, Book 37, Hadith 4114
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