Deuteronomy 20:10-18
10 “When you approach a city to fight against it, you must make an offer of peace.
11 If it accepts your offer of peace and opens its gates to you, all the people found in it will become forced laborers for you and serve you.
12 However, if it does not make peace with you but wages war against you, lay siege to it.
13 When the Lord your God hands it over to you, you must strike down all its males with the sword.
14 But you may take the women, children, animals, and whatever else is in the city—all its spoil—as plunder. You may enjoy the spoil of your enemies that the Lord your God has given you.
15 This is how you are to treat all the cities that are far away from you and are not among the cities of these nations.
16 However, you must not let any living thing survive among the cities of these people the Lord your God is giving you as an inheritance.
17 You must completely destroy them—the Hittite, Amorite, Canaanite, Perizzite, Hivite, and Jebusite—as the Lord your God has commanded you,
18 so that they won’t teach you to do all the detestable things they do for their gods, and you sin against the Lord your God.(A)