The Prophet (ﷺ) said to me during Hajjat-al-Wida`: Let the people keep quiet and listen. Then he said (addressing the people), "Do not (become infidels) revert to disbelief after me by striking the necks (cutting the throats) of one another (killing each other).
Reference: Sahih al-Bukhari 121 In-book : Book 3, Hadith 63 USC-MSA web (English) : Vol. 1, Book 3, Hadith 122 (deprecated)
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