Exodus 17:10-12

New Catholic Bible

¹⁰ Joshua did all that Moses had commanded him to do and he fought against Amalek while Moses, Aaron, and Hur stood on the top of the hill. ¹¹ When Moses lifted his hands, Israel was stronger, but when he lowered them, Amalek was stronger. ¹² Moses’ hands grew heavy as he tired, so they took a stone and placed it under him as a stool. Aaron and Hur stood on either side and held up his hands. Thus, his hands were held steady until the sun set.