Musannaf Ibn Abi Shaybah

Hazrat Ash'ath (may Allah have mercy on him) narrates that Hasan Basri (may Allah have mercy on him) considered it disliked to kill a very old person, children, and women in the land of war. And he (may Allah have mercy on him) also considered it disliked that a person should take any of them along with him, and then if carrying them becomes burdensome for him, he should abandon them on the way.