Deuteronomy 20:9-11

New Catholic Bible

⁹ When the officers have finished speaking to the people, they are to appoint commanders to lead the people. ¹⁰ When you approach a city to do battle with it, offer it terms of peace. ¹¹ If they accept your terms of peace and open their gates to you, then all the people who live there shall be subject to forced labor done on your behalf.