(1) باب
It was narrated that Abu Idris said:
"I heard Mu'awiyah delivering the Khutbah, and he narrated a few Hadiths from the Messenger of Allah [SAW]." He said: "I heard him delivering a Khutbah and he said: 'I heard the Messenger of Allah [SAW] say: Every sin may be forgiven by Allah except a man who kills a believer deliberately, or a man who dies as a disbeliever.'" (ID)
Reference (ID): Sunan an-Nasa'i 3984 (ID)
In-book reference (ID): Book 37, Hadith 19 (ID)
English translation (ID): Vol. 5, Book 37, Hadith 3989 (ID)