It was narrated from Ibn ‘Umar that the Prophet (ﷺ) saw a woman who had been killed on the road, and he forbade killing women and children.
Sunan Ibn Majah Book 24, Hadith 89
← Previous Hadith “We attacked Hawazin, with Abu Bakr, during the time of the Prophet (ﷺ), and we arrived at an oasis belonging to Bani Fazarah during the last part of the night. We attacked at dawn, raiding the people of the oasis, and killed them, nine or seven households.”

Sunan Ibn Majah Book 24, Hadith 88 Next Hadith → “We went out to fight alongside the Messenger of Allah (ﷺ), and we passed by a slain woman whom the people had gathered around. They parted (to let the Prophet (ﷺ) through) and he said: ‘This (woman) was not one of those who were fighting.’ Then he said to a man: ‘Go to Khalid bin Walid and tell him that the Messenger of Allah (ﷺ) commands you: “Do not kill any children or women, or any (farm) laborer.’”

Another chain reports a similar hadith.

Sunan Ibn Majah Book 24, Hadith 90