Exodus 17:8-16

8Then the Amalekites came and fought with Israel at Rephidim.

9Moses said to Joshua, “Choose men, go out, and fight the Amalekites. Tomorrow I will stand on the top of the hill with the staff of God in my hand.”

10So Joshua did as Moses said, and fought the Amalekites, while Moses, Aaron and Hur went up to the top of the hill.

11When Moses held up his hand, Israel prevailed. But when he let down his hand, the Amalekites prevailed.

12Moses’ hands grew heavy, so they took a stone, put it under him, and he sat down. Aaron and Hur held up his hands, one on each side. So his hands were steady until the sun went down.

13So Joshua overpowered the Amalekites and his army with the edge of the sword.

14Adonai said to Moses, “Write this for a memorial in the book, and rehearse it in the hearing of Joshua, for I will utterly blot out the memory of the Amalekites from under heaven.”

15Then Moses built an altar, and called the name of it Adonai-Nissi.

16Then he said, “By the hand upon the throne of Adonai, Adonai will have war with Amalek from generation to generation.”