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he Prophet Muhammad (peace be upon him) once saw the corpse of a woman who had been killed in a military action, and he disapproved of it and forbade the killing of women and children.
Abu Bakr as-Siddiq, a companion of the Prophet Muhammad and his successor as head of the Muslim community, advised one of his military commanders: "Do not kill women or children or an aged, infirm person. Do not cut down fruit-bearing trees. Do not destroy an inhabited place."
--------- Al-Muwatta, Volume 21, Hadith 9 and 10
The Prophet Muhammad (peace be upon him) said: "He will not enter Paradise whose neighbour is not secure from his wrongful conduct."
--------- Sahih Muslim, Hadith 15
The Prophet Muhammad (peace be upon him) once told his wife: "Avoid Cruelty and injustice..and guard yourselves against miserliness, for this has ruined nations who lived before you."
--------- Riyadh-us-Salaheen, Hadith 203
There are many hadith on the topic , it depends what you want it in connection with.