Samurah (RAA) narrated that The Messenger of Allah (ﷺ) said:

“Kill the mature men of the polytheists but spare their children.” Related by Abu Dawud and At-Tirmidhi graded it as Sahih.

وَعَنْ سَمُرَةَ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{

اُقْتُلُوا شُيُوخَ اَلْمُشْرِكِينَ, وَاسْتَبْقُوا شَرْخَهُمْ

} رَوَاهُ أَبُو دَاوُدَ, وَصَحَّحَهُ اَلتِّرْمِذِيُّ [1]‏ .‏