17 Now kill all the boys. And kill every woman who has slept with a man, 18 but save for yourselves every girl who has never slept with a man.
– Numbers 31:17-18 (NIV)

16 However, in the cities of the nations the Lord your God is giving you as an inheritance, do not leave alive anything that breathes. 17 Completely destroy them—the Hittites, Amorites, Canaanites, Perizzites, Hivites and Jebusites—as the Lord your God has commanded you. 18 Otherwise, they will teach you to follow all the detestable things they do in worshiping their gods, and you will sin against the Lord your God.
– Deuteronomy 20:16-18 (NIV)

9 Whenever David attacked an area, he did not leave a man or woman alive, but took sheep and cattle, donkeys and camels, and clothes. Then he returned to Achish.
– 1 Samuel 27:9 (NIV)

6 We completely destroyed them, as we had done with Sihon king of Heshbon, destroying every city—men, women and children.
– Deuteronomy 3:6 (NIV)