ENOfficial
Abu Huraira reported the Prophet (ﷺ) as saying, “Faith is an assurance of safety from being killed unawares. A believer does not kill another unawares.” Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «الْإِيمَانُ قَيَّدَ الْفَتْكَ لَا يفتِكُ مُؤمنٌ» . رَوَاهُ أَبُو دَاوُد
sunnah.com