Deuteronomy 20:17-19

21st Century King James Version

¹⁷ but thou shalt utterly destroy them, namely: the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites, as the Lord 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 ye should sin against the Lord your God.

¹⁹ “When thou shalt besiege a city a long time, in making war against it to take it, thou shalt not destroy the trees thereof by forcing an ax against them, for thou mayest eat of them; and thou shalt not cut them down to employ them in the seige, for the tree of the field is man’s life.