‘Abd Allaah bin (mas’ud) said “A woman was found slain in one of the battles of the Apostle of Allaah ﷺ. The Apostle of Allaah ﷺ forbade to kill women and children. (Using translation from Abū Dāʾūd 2668)   

وُجِدَ فِي بَعْضِ مَغَازِي رَسُولِ اللَّهِ ﷺ امْرَأَةٌ مَقْتُولَةٌ «فَنَهَى رَسُولُ اللَّهِ ﷺ عَنْ قَتْلِ النِّسَاءِ وَالصِّبْيَانِ»  

[Machine] "We went out with the Messenger of Allah ﷺ on expeditions and defeated the polytheists. The people were quick to kill until they killed the young. When the Prophet ﷺ came to know about this, he said, 'What is the matter with people that they killed the young? Verily, the killing of young children should not be done, not even three of them.'"  

خَرَجْنَا مَعَ رَسُولِ اللَّهِ ﷺ فِي غَزَاةٍ فَظَفِرَنَا بِالْمُشْرِكِينَ فَأَسْرَعَ النَّاسُ فِي الْقَتْلِ حَتَّى قَتَلُوا الذُّرِّيَّةَ فَبَلَغَ ذَلِكَ النَّبِيَّ ﷺ فَقَالَ «مَا بَالُ أَقْوَامٍ ذَهَبَ بِهُمُ الْقَتْلُ حَتَّى قَتَلُوا الذُّرِّيَّةَ؟ أَلَا لَا تُقْتَلَنَّ ذُرِّيَّةٌ ثَلَاثًا»