ENOfficial
Samura b. Jundub reported the Prophet (ﷺ) as saying, “Kill the old men who are polytheists, but spare their sharkh i.e., their children. Tirmidhi and Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَن سَمُرَة بن جُنْدُبٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «اقْتُلُوا شُيُوخَ الْمُشْرِكِينَ وَاسْتَحْيُوا شَرْخَهُمْ» أَيْ صِبْيَانَهُمْ. رَوَاهُ التِّرْمِذِيّ وَأَبُو دَاوُد
sunnah.com