Sahih al-Bukhari 3014

Arabic

حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، أَخْبَرَنَا اللَّيْثُ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ ـ رضى الله عنه ـ أَخْبَرَهُ أَنَّ امْرَأَةً وُجِدَتْ فِي بَعْضِ مَغَازِي النَّبِيِّ صلى الله عليه وسلم مَقْتُولَةً، فَأَنْكَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم قَتْلَ النِّسَاءِ وَالصِّبْيَانِ‏.‏

English translation

Narrated `Abdullah:During some of the Ghazawat of the Prophet (ﷺ) a woman was found killed. Allah's Messenger (ﷺ) disapproved the killing of women and children

Reference: Sahih al-Bukhari 3014, Book of Fighting for the Cause of Allah (Jihaad). English translation by Dr. Muhammad Muhsin Khan.