1 Samuel 14:48
And he did great things, and overcame the Amalekites, and made Israel safe from the hands of their attackers.
Exodus 17:14
And the Lord said to Moses, Make a record of this in a book, so that it may be kept in memory, and say it again in the ears of Joshua: that all memory of Amalek is to be completely uprooted from the earth.
Deuteronomy 25:19
So when the Lord your God has given you rest from all who are against you on every side, in the land which the Lord your God is giving you for your heritage, see to it that the memory of Amalek is cut off from the earth; keep this in mind.
1 Samuel 15:3-7
Go now and put Amalek to the sword, putting to the curse all they have, without mercy: put to death every man and woman, every child and baby at the breast, every ox and sheep, camel and ass.