Deuteronomy 25:19

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 Amalek came and fought against Israel at Rephidim.

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 said, “My presence shall go with you, and I will give you rest.”

for you have not as yet come to the resting place and the inheritance which Yahweh your God is giving you.

So Joshua took the whole land, according to all that Yahweh had spoken to Moses, and Joshua gave it for an inheritance to Israel according to their divisions by their tribes. Thus the land was quiet from war.

“Thus says Yahweh of hosts, ‘I will punish Amalek for what he did to Israel, how he set himself against him on the way while he was coming up from Egypt.