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:(Deuteronomy 20:17)

That they teach you not to do after all their abominations, which they have done unto their gods; so should ye sin against the LORD your God.(Deuteronomy 20:18)

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 axe against them: for thou mayest eat of them, and thou shalt not cut them down (for the tree of the field is man's life) to employ them in the siege:(Deuteronomy 20:19)

Only the trees which thou knowest that they be not trees for meat, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it be subdued.

If one be found slain in the land which the LORD thy God giveth thee to possess it, lying in the field, and it be not known who hath slain him:(Deuteronomy 21:1)

Then thy elders and thy judges shall come forth, and they shall measure unto the cities which are round about him that is slain:(Deuteronomy 21:2)

And it shall be, that the city which is next unto the slain man, even the elders of that city shall take an heifer, which hath not been wrought with, and which hath not drawn in the yoke;(Deuteronomy 21:3)

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Deuteronomy 20:20 - Cross Reference

For thus hath the LORD of hosts said, Hew ye down trees, and cast a mount against Jerusalem: this is the city to be visited; she is wholly oppression in the midst of her. (Jeremiah 6:6)

Neither shall Pharaoh with his mighty army and great company make for him in the war, by casting up mounts, and building forts, to cut off many persons: (Ezekiel 17:17)

For thus saith the LORD, the God of Israel, concerning the houses of this city, and concerning the houses of the kings of Judah, which are thrown down by the mounts, and by the sword; (Jeremiah 33:4)

Therefore thus saith the LORD concerning the king of Assyria, He shall not come into this city, nor shoot an arrow there, nor come before it with shields, nor cast a bank against it. (Isaiah 37:33)

And he made in Jerusalem engines, invented by cunning men, to be on the towers and upon the bulwarks, to shoot arrows and great stones withal. And his name spread far abroad; for he was marvelously helped, till he was strong. (2 Chronicles 26:15)

Whither shall we go up? our brethren have discouraged our heart, saying, The people is greater and taller than we; the cities are great and walled up to heaven; and moreover we have seen the sons of the Anakims there. (Deuteronomy 1:28)

There was a little city, and few men within it; and there came a great king against it, and besieged it, and built great bulwarks against it: (Ecclesiastes 9:14)