Deuteronomy 20:17-19

Modern English Version

¹⁷ But you shall completely destroy them: namely, the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites, just as the Lord your God has commanded you, ¹⁸ so that they do not teach you to participate in all their abominations, which they have done to their gods, causing you to sin against the Lord your God.

¹⁹ When you lay siege to a city for a long time, in making war against it in order to take it, you shall not destroy the trees there by chopping them down with an axe, for you may eat from them, and you shall not cut them down. For the tree of the field is not a man in which to lay siege.