(5) باب لاَ تَرْجِعُوا بَعْدِي كُفَّارًا يَضْرِبُ بَعْضُكُمْ رِقَابَ بَعْضٍ
It was narrated from Sunabih Al-Ahmasi that the Messenger of Allah(ﷺ) said:
"I shall reach the Cistern (Haud) before you, and Iwillboast of your great numbers before the nations, so do not fightoneanother after I am gone.'"
Reference: Sunan Ibn Majah 3944
In-book reference: Book 36, Hadith 19
English translation: Vol. 5, Book 36, Hadith 3944