'Exterminate' in the Bible

The Lord sent you on a campaign saying, 'Go and exterminate those sinful Amalekites! Fight against them until you have destroyed them.'

Now David and his men went up and raided the Geshurites, the Girzites, and the Amalekites [the enemies of Israel that Joshua had failed to annihilate]; for they had inhabited the land from ancient times, as one comes to Shur even as far as the land of Egypt.