ENOfficial
It is narrated by Sa'b b. Jaththama that he said (to the Holy Prophet): Messenger of Allah, we kill the children of the polytheists during the night raids. He said: They are from them.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ عُبَيْدِ، اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ عَنِ ابْنِ عَبَّاسٍ، عَنِ الصَّعْبِ بْنِ جَثَّامَةَ، قَالَ قُلْتُ يَا رَسُولَ اللَّهِ إِنَّا نُصِيبُ فِي الْبَيَاتِ مِنْ ذَرَارِيِّ الْمُشْرِكِينَ قَالَ " هُمْ مِنْهُمْ " .
sunnah.com