(7) باب مَنْ تَرَكَ قِتَالَ الْخَوَارِجِ لِلتَّأَلُّفِ، وَأَنْ لاَ يَنْفِرَ النَّاسُ عَنْهُ
Narrated Yusair bin `Amr:
I asked Sahl bin Hunaif, "Did you hear the Prophet (ﷺ) saying anything about Al-Khawarij?" He said, "I heard him saying while pointing his hand towards Iraq. "There will appear in it (i.e, Iraq) some people who will recite the Qur'an but it will not go beyond their throats, and they will go out from (leave) Islam as an arrow darts through the game's body.' "
Reference: Sahih al-Bukhari 6934
In-book reference: Book 88, Hadith 16
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 84, Hadith 68