Exodus 17:10
Joshua did as Moses had instructed him and fought against the Amalekites, while Moses, Aaron, and Hur went up to the top of the hill.

Exodus 17:12
When Moses' hands grew heavy, they took a stone and put it under him, and he sat on it. Then Aaron and Hur held his hands up, one on each side, so that his hands remained steady until the sun went down.

Joshua 8:26
Joshua did not draw back his hand that held his battle lance until all the inhabitants of Ai were completely destroyed.