Exodus 17:8-12

8Then 1Amalek came and fought against Israel at 2Rephidim.

9So Moses said to 3Joshua, “Choose men for us and go out, fight against Amalek. Tomorrow I will station myself on the top of the hill with 4the staff of God in my hand.”

10Joshua did as Moses 5told him, 6and fought against Amalek; and Moses, Aaron, and 7Hur went up to the top of the hill.

11So it came about when Moses held his hand up, that Israel prevailed, and when he let his hand 8down, Amalek prevailed.

12But Moses’ hands were heavy. Then they took a stone and put it under him, and he sat on it; and Aaron and Hur 9supported his hands, one on one side and one on the other. Thus his hands were steady until the sun set.