Exodus 17:8-12 CEV
When the Israelites were at Rephidim, they were attacked by the Amalekites. So Moses told Joshua, “Have some men ready to attack the Amalekites tomorrow. I will stand on a hilltop, holding this walking stick that has the power of God.”
Joshua led the attack as Moses had commanded, while Moses, Aaron, and Hur stood on the hilltop. The Israelites out-fought the Amalekites as long as Moses held up his arms, but they started losing whenever he lowered them. After a while, his arms were so tired that Aaron and Hur got a rock for him to sit on. Then they stood beside him and supported his arms in the same position until sunset.
CEV: Contemporary English Version