Bulugh al-Maram, Book 11, Hadith 1297 (In-Book)

Sa'id bin Jubair (RAA) narrated, ‘The Messenger of Allah killed three men on the day of Badr while they were in bonds (by throwing arrows at them until they died).’ Related by Abu Dawud.

وَعَنْ سَعِيدِ بْنِ جُبَيْرٍ; { أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَتَلَ يَوْمَ بَدْرٍ ثَلَاثَةً صَبْراً } أَخْرَجَهُ أَبُو دَاوُدَ فِي "اَلْمَرَاسِيلِ" وَرِجَالُهُ ثِقَاتٌ 1‏.‏ ‏1 ‏- ضعيف؛ لإرساله.‏ وهو في "المراسيل" برقم ( 337 )‏.‏

sunnah.com

also referenced under: Book 11, Hadith 1323 (English)