10 So Joshua did as Moses had said to him, and fought with Amalek: and Moses, Aaron, and Hur went up to the top of the hill.
11 And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed.
12 But Moses' hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun.
13 And Joshua discomfited Amalek and his people with the edge of the sword.
14 And the LORD said unto Moses, Write this for a memorial in a book, and rehearse it in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven.
15 And Moses built an altar, and called the name of it Jehovah-nissi:
16 For he said, Because the LORD hath sworn that the LORD will have war with Amalek from generation to generation.
Exodus 18
1 When Jethro, the priest of Midian, Moses' father in law, heard of all that God had done for Moses, and for Israel his people, and that the LORD had brought Israel out of Egypt;
2 Then Jethro, Moses' father in law, took Zipporah, Moses' wife, after he had sent her back,
3 And her two sons; of which the name of the one was Gershom; for he said, I have been an alien in a strange land:
4 And the name of the other was Eliezer; for the God of my father, said he, was mine help, and delivered me from the sword of Pharaoh: