Amalek

"Thus says the Lord of hosts: ‘I will punish Amalek for what he did to Israel, how he ambushed him on the way when he came up from Egypt. Now go and attack[a] Amalek, and utterly destroy all that they have, and do not spare them. But kill both man and woman, infant and nursing child, ox and sheep, camel and donkey.’"

"So Joshua defeated Amalek and his people with the edge of the sword."

"Remember what Amalek did to you on the way as you were coming out of Egypt, how he met you on the way and attacked your rear ranks, all the stragglers at your rear, when you were tired and weary; and he did not fear God. Therefore it shall be, when the Lord your God has given you rest from your enemies all around, in the land which the Lord your God is giving you to possess as an inheritance, that you will blot out the remembrance of Amalek from under heaven. You shall not forget."