(5) باب لاَ تَرْجِعُوا بَعْدِي كُفَّارًا يَضْرِبُ بَعْضُكُمْ رِقَابَ بَعْضٍ
It was narrated from Ibn 'Umar that the Messenger of Allah (ﷺ)said:
"Woe to you! Do not turn back into disbelievers after I amgone,striking one another's necks."
Reference: Sunan Ibn Majah 3943
In-book reference: Book 36, Hadith 18
English translation: Vol. 5, Book 36, Hadith 3943