Exodus 17:8-10

Young's Literal Translation

⁸ And Amalek cometh, and fighteth with Israel in Rephidim,

⁹ and Moses saith unto Joshua, `Choose for us men, and go out, fight with Amalek: to-morrow I am standing on the top of the hill, and the rod of God in my hand.'

¹⁰ And Joshua doth as Moses hath said to him, to fight with Amalek, and Moses, Aaron, and Hur, have gone up [to] the top of the height;