Exodus 17:8-16 - Battle With The Amalekites

⁸ After this, the Amalekites came and fought with the Israelis at Rephidim. ⁹ Moses told Joshua, "Choose some men for us and go out to fight against the Amalekites. Tomorrow I'll stand on top of the hill with the staff of God in my hand."

¹⁰ So Joshua did as Moses told him and fought against the Amalekites, while Moses, Aaron, and Hur went up to the top of the hill. ¹¹ Whenever Moses raised his hand, the Israelis prevailed, but when his hand remained at his side, then the Amalekites prevailed. ¹² When Moses' hands became heavy, they took a stone and put it under him, and he sat on it. Aaron and Hur supported his hands, one on one side and one on the other, and so his hands were steady until the sun went down. ¹³ Joshua defeated Amalek and his army using swords.

¹⁴ Then the LORD told Moses, "Write this in a book as a memorial and recite it to Joshua: "I'll certainly wipe out the memory of the Amalekites from under heaven.'"

¹⁵ Moses built an altar and named it "The LORD is My Banner." ¹⁶ "Because," he said, "a fist has been raised in defiance against the throne of the LORD, the LORD will wage war against Amalek from generation to generation."