The Amalekites were one of the many nations who the Israelites had to fight. When Moses stood with the staff of God in his hands held high, the Israelites were winning the battle. When he lowered his arms because of fatigue the Amalekites began to win. His relatives came to his rescue. Aaron and Hur sat him down on a stone and held his arms up for him.
This is an example of how we all need each other as Christians. By prayer and practical support we can uplift and support others. Prayer for others will be a constant help to those in the thick of the battle. By practical support we can also be there for them and help them in their work and walk with the Lord.