When the children of Israel complain that there is no water, God directs Moses to strike the rock and water comes out of the rock. Then, God leads Moses and the children of Israel into battle with Amalek. When Moses has his hands lifted, the children of Israel, win the battle but when he puts them down because he is tired, they lose. Moses hands are raised as if they are a banner and when they win the battle, Moses builds an altar and names the place Jehovah Nissi which means, THE LORD IS MY BANNER
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