Bible: Deut 20:17-18

20:17 Instead you must utterly annihilate them 1 the Hittites, 2  Amorites, 3  Canaanites, 4  Perizzites, 5  Hivites, 6  and Jebusites 7 just as the Lord your God has commanded you, 20:18 so that they cannot teach you all the abhorrent ways they worship 8  their gods, causing you to sin against the Lord your God.
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