Musannaf Ibn Abi Shayba 28:587

Ibn ‘Uyaynah narrated to us, from al-Zuhri, from ‘Abd al-Rahman ibn Ka‘b, from his paternal uncle, that when the Messenger of Allah (may Allah bless him and grant him peace) sent him to Ibn Abi al-Huqayq, he forbade him from killing women and children.