Exodus 17:8-10

American Standard Version

⁸ Then came Amalek, and fought with Israel in Rephidim. ⁹ And Moses said unto Joshua, Choose us out men, and go out, fight with Amalek: to-morrow I will stand on the top of the hill with the rod of God in my hand. 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.