Exodus 17:12

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

So Moses arose with Joshua his attendant, and Moses went up to the mountain of God.

But to the elders he said, “Remain here for us until we return to you. And behold, Aaron and Hur are with you; whoever has a legal matter, let him approach them.”

“Remember what Amalek did to you along the way when you came out from Egypt,

Then Yahweh said to Joshua, “Stretch out the javelin that is in your hand toward Ai, for I will give it into your hand.” So Joshua stretched out the javelin that was in his hand toward the city.

For Joshua did not withdraw his hand with which he stretched out the javelin until he had devoted to destruction all the inhabitants of Ai.

“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.