Genesis 14:7

7Then they turned back and came to En-mishpat (that is, aKadesh) and defeated all the country of the Amalekites, and also the Amorites who were dwelling bin Hazazon-tamar.

Exodus 17:8-16

Israel Defeats Amalek

8 cThen Amalek came and fought with Israel at Rephidim. 9So Moses said to dJoshua, “Choose for us men, and go out and fight with Amalek. Tomorrow I will stand on the top of the hill with ethe staff of God in my hand.” 10So fJoshua did as Moses told him, and fought with Amalek, while Moses, Aaron, and gHur went up to the top of the hill. 11Whenever Moses hheld up his hand, Israel prevailed, and whenever he lowered his hand, Amalek prevailed. 12But Moseshands grew weary, so they took a stone and put it under him, and he sat on it, while Aaron and iHur held up his hands, one on one side, and the other on the other side. So his hands were steady until the going down of the sun. 13And jJoshua overwhelmed Amalek and his people with the sword.

14Then the Lord said to Moses, “Write this as a memorial in a book and recite it in the ears of kJoshua, that lI will utterly blot out the memory of Amalek from under heaven.” 15And Moses mbuilt an altar and called the name of it, The Lord Is My Banner, 16saying, “A hand upon the throne
A slight change would yield  upon the banner
of the Lord! oThe Lord will have war with Amalek from generation to generation.”

Numbers 24:20

20Then he looked on Amalek and ptook up his discourse and said,

Amalek was the first among the nations,
qbut its end is utter destruction.”

Deuteronomy 25:17-19

17 rRemember what Amalek did to you son the way as you came out of Egypt, 18how he attacked you on the way when you were faint and weary, and tcut off your tail, those who were lagging behind you, and he did not fear God. 19Therefore uwhen the Lord your God has given you rest from all your enemies around you, in the land that the Lord your God is giving you for an inheritance to possess, you shall vblot out the memory of Amalek from under heaven; you shall not forget.

1 Samuel 15:3

3Now go and strike Amalek and wdevote to destruction
That is, set apart ( devote) as an offering to the Lord (for destruction); also verses 8, 9, 15, 18, 20, 21
all that they have. Do not spare them, ybut kill both man and woman, child and infant, ox and sheep, camel and donkey.’”

1 Samuel 27:8

8Now David zand his men went up and made raids against aathe Geshurites, abthe Girzites, and acthe Amalekites, for these were the inhabitants of the land from of old, adas far as Shur, to the land of Egypt.
Copyright information for ESV