Sunan Abi Dawud 2666
سنن أبي داود#2666Da'ifحَدَّثَنَا مُحَمَّدُ بْنُ عِيسَى، وَزِيَادُ بْنُ أَيُّوبَ، قَالاَ حَدَّثَنَا هُشَيْمٌ، أَخْبَرَنَا مُغِيرَةُ، عَنْ شِبَاكٍ، عَنْ إِبْرَاهِيمَ، عَنْ هُنَىِّ بْنِ نُوَيْرَةَ، عَنْ عَلْقَمَةَ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَعَفُّ النَّاسِ قِتْلَةً أَهْلُ الإِيمَانِ " .
Narrated Abdullah ibn Mas'ud: The Prophet (ﷺ) said: The most merciful of the people in respect of killing are believers (in Allah)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniDaif
Muhammad Muhyi Al-Din Abdul HamidDaif
Zubair Ali ZaiDaif
In-book reference: 15:190