Yahya related to me from Malik from Nafi from Ibn Umar that theMessenger of Allah, may Allah bless him and grant him peace, saw thecorpse of a woman who had been slain in one of the raids, and hedisapproved of it and forbade the killing of women and children.
USC-MSA web (English) reference: Book 21, Hadith 9
Arabic reference: Book 21, Hadith 970