Exodus 17:8 says, Then came Amalek, and fought with Israel in Rephidim.  The Israelites encountered their first fight since leaving Egypt when Amalek came to fight against them.  As followers of Christ, we can be certain that it won't be long after we accept Christ as our Savior and Lord that we will have the world come to fight us.  Verse seventeen states, And Moses said unto Joshua, Choose us out men, and go out, fight with Amalek: to morrow I will stand on the top of the hill with the rod of God in mine hand.  Moses had Joshua choose the men to go fight, and Moses was going to stand at the top tof the hill with the rod of God in his hand.  We are not told so, but must assume that Moses prayed about this and believed it to be God's will for them.  I believe that this was a representation to the people of Israel that God was watching over them.  Though we have no physical sign today, we as Christians can be certain that God is watching over us at all times.  Verse ten adds, So Joshua did as Moses had said to him, and fought with Amalek: and Moses, Aaron, and Hur went up to the top of the hill.  Joshua went to fight with Amalek and Moses went up to the top of the hill with Aaron and Hur.  Moses did not go alone relying only on his own strength to fulfill his role.  Though I know God could have given Moses the ability to do this alone, Moses wanted some others with him.  Even if they aren't with us physically, when we go to do what God has called us to do, we need to realize that other Christians are with us spiritually.  Verse eleven declares, And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed.  When Moses held up his hand with the rod of God in it, Israel would be winning, but when he let it down, Amalek would be winning.  As stated before, the rod was nothing magical, but represented the presence of God to the people.  We today will always be successful over the powers of the world when we rely on God's presence to guide our lives.  When we let our guard down and begin to rely on our own abilities, then we will be like the people of Israel when they were not under the protection of God.  Verse twelve adds, But Moses’ hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun.  Aaron and Hur sat Moses down and propped up his hands until the sun set.  We today may need help from other Christians at times when we seem too tired to carry on, but fortunately we are never alone.  We should always be ready to accept help from others when we need it and offer it to others when they need it.  Sometimes we may be like Moses, but at other times we may be like Joshua and Hur.  Verse thirteen adds, And Joshua discomfited Amalek and his people with the edge of the sword.  Joshua and his army, by  the power of God, defeated Amalek.  When we are doing what God calls us to do by His power, we will never suffer an ultimate defeat.  Verse fourteen declares, And the LORD said unto Moses, Write this for a memorial in a book, and rehearse it in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven.  God told Moses to write a memorial in a book and rehearse it with Joshua, and that God would remove the remembrance of Amalek from under the heavens.  Today, those who accept Christ as their Savior and Lord have their names written down in God's book of life, and those who do not will ultimately have their names forgotten forever.  Verse fifteen states, And Moses built an altar, and called the name of it Jehovahnissi:  Then verse sixteen adds, For he said, Because the LORD hath sworn that the LORD will have war with Amalek from generation to generation.  Moses built an altar to God to celebrate God's victory over Amalek.  As Christians, we should always be quick to give God the glory when we are victorious over the forces of evil.  God could have just eliminated Amalek by His own power, but He chose to allow the people of Israel to be involved in the battle.  Just as they went to face and fight the enemy, so must we today.  We cannot just withdraw from the world and allow God to do everything.  I believe that God expects us to be out in the world fighting for what is right.