First reading: Exodus 17:8-13

The Amalekites came and attacked Israel at Rephidim. Moses said to Joshua, ‘Pick out men for yourself, and tomorrow morning march out to engage Amalek. I, meanwhile, will stand on the hilltop, the staff of God in my hand.’ Joshua did as Moses told him and marched out to engage Amalek, while Moses and Aaron and Hur went up to the top of the hill. As long as Moses kept his arms raised, Israel had the advantage; when he let his arms fall, the advantage went to Amalek. But Moses’ arms grew heavy, so they took a stone and put it under him and on this he sat, Aaron and Hur supporting his arms, one on one side, one on the other; and his arms remained firm till sunset. With the edge of the sword Joshua cut down Amalek and his people.