Sahih Bukhari
Sahih Bukhari Volume 009, Book 084, Hadith Number 066.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 84. Dealing with Apostates
Narrated By 'Abdullah bin 'Umar : Regarding Al-Harauriyya: The Prophet said, "They will go out of Islam as an arrow darts out of the game's body."