Deuteronomy 20:13

New International Version

When the Lord your God delivers it into your hand, put to the sword all the men in it.

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The Lord says to my lord: “Sit at my right hand until I make your enemies a footstool for your feet.”

But those enemies of mine who did not want me to be king over them—bring them here and kill them in front of me.’ ”

If they refuse to make peace and they engage you in battle, lay siege to that city.