Mishkat al-Masabih
Mishkat al-Masabih 3548
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «الْإِيمَانُ قَيَّدَ الْفَتْكَ لَا يفتِكُ مُؤمنٌ» . رَوَاهُ أَبُو دَاوُد
Translation
Abu Hurayra reported that the Prophet said: Faith restrains treacherous killing; a believer does not kill treacherously. Abu Dawud transmitted it.