1 Samuel 15:3

Timna was a concubine of Esau’s son Eliphaz, and she bore Amalek to Eliphaz. These are the sons of Esau’s wife Adah.

Then Yahweh said to Moses, “Write this in a book as a memorial and recite it in Joshua’s hearing, that I will utterly blot out the memory of Amalek from under heaven.”

And he acted valiantly and struck down the Amalekites and delivered Israel from the hands of those who plundered them.

But Saul and the people spared Agag and the best of the sheep, the oxen, the fatlings, the lambs, and all that was good, and they were not willing to devote them to destruction; but everything despised and worthless, that they utterly destroyed.

and Yahweh sent you on a mission and said, ‘Go and devote to destruction the sinners, the Amalekites, and fight against them until they are consumed.’

So he struck Nob the city of the priests with the edge of the sword, both men and women, infants and nursing babies; also oxen, donkeys, and sheep he struck with the edge of the sword.

And David struck the land and did not leave a man or a woman alive, and he took away the sheep, the cattle, the donkeys, the camels, and the clothing. Then he returned and came to Achish.

Then David struck them down from the twilight until the evening of the next day; and not a man of them escaped, except four hundred young men who rode on camels and fled.

“And he said to me, ‘Who are you?’ And I answered him, ‘I am an Amalekite.’