Deuteronomy 20:17-19

Darby Translation

¹⁷ but shalt utterly devote them to destruction, the Hittites and the Amorites, the Canaanites and the Perizzites, the Hivites and the Jebusites, as Jehovah thy God hath commanded thee;

¹⁸ that they teach you not to do according to all their abominations, which they have done unto their gods, so that ye sin against Jehovah your God.

¹⁹ When thou shalt besiege a city many days, in making war against it to take it, thou shalt not destroy the trees thereof by lifting up an axe against them; for thou canst eat of them; and thou shalt not cut them down, for is the tree of the field a man that it should be besieged?