Abu Dawud Book 8, Hadith Number 2660.Abu Dawud Book 8. Jihad Chapter : Not known. Narated By Abdullah ibn Mas’ud : The Prophet (PBUH) said: The most merciful of the people in respect of killing are believers (in Allah). Related Previous Post Abu Dawud Book 1, Hadith Number 82. Next Post Abu Dawud Book 1, Hadith Number 81.