Mishkat al-Masabih 3955
Rabah b. ar-Rabi’ said:
When we were with God’s Messenger on an expedition he saw some people collected together over something and sent a man whom he told to see what these people were collected around. When he came and told him they were round a woman who had been killed he said, “This is not one with whom fighting should have taken place.” Khalid b. al-Walid was in charge of the van, so he sent a man to tell him not to kill a woman or a hired servant. 

Abu Dawud transmitted it.
وَعَن رَبَاح بن الرَّبيعِ قَالَ: كُنَّا مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي غزوةٍ فَرَأى الناسَ مجتمعينَ عَلَى شَيْءٍ فَبَعَثَ رَجُلًا فَقَالَ: «انْظُرُوا عَلَى من اجْتمع هَؤُلَاءِ؟» فَقَالَ: عَلَى امْرَأَةٍ قَتِيلٍ فَقَالَ: «مَا كَانَتْ هَذِهِ لِتُقَاتِلَ» وَعَلَى الْمُقَدِّمَةِ خَالِدُ بْنُ الْوَلِيدِ فَبَعَثَ رَجُلًا فَقَالَ: 
" قُلْ لِخَالِدٍ: لَا تَقْتُلِ امْرَأَة وَلَا عسيفا ". رَوَاهُ أَبُو دَاوُد