Eventually, the people of Israel got tired of living in Sin (ba dum, tish), packed up, and traveled to Rephidim. Unfortunately for them, there was no water there, and everyone got very thirsty.

As was their custom, the Israelites did the same thing they did every time anything bad happened to them: They berated Moses and God for having the gall to rescue them from the Egyptians in the first place. Moses, taken aback by this ingratitude just because some people happened to be dying of thirst, said, "What is wrong with you people? Can't we have one little crisis without everyone turning against God? Are you trying to piss him off? Seriously guys, get a grip."

This didn’t go over as well as Moses had hoped, and he found himself running off to God, dodging the occasional rock hurled in his direction on the way. Once there, Moses asked God what he was supposed to do about the angry mob trying to stone him to death. God told Moses to go to a particular rock in Horeb and strike it with his trusty staff. Once he had done this, water would flow from the rock, and everyone could get a drink.

So Moses struck the rock, water flowed from it, and everyone was happy again until the next time one of them got a hangnail. In celebration of the miraculous water-giving rock, they named the place Massah and Meribah, which translates to "place where everyone bitched and doubted God until God gave us water to shut us up, instead of smiting us like he should have done, and Moses got to whip out his staff again."

While everyone was busy not being pissed off at God for once, some guy named Amalek came by to stir up trouble with the Israelites. Moses told Joshua to go get some men and fight Amalek. In the meantime, Moses would make his way to a hill overlooking the battlefield, where he could sit down with some freshly popped manna-corn and rock-water and watch the battle with his good buddies Aaron and Hur.

Moses began to lift his arm up and down for some reason, possibly attempting to do some jumping jacks or engage in a primitive form of "raising the roof". Whatever he was doing, it was discovered that whenever his arms were raised, Joshua's men started to win the battle. However, whenever his arms fell, Amalek's men started to win. Unfortunately, Moses wasn't a spring chicken anymore and got tired quickly, so he was having trouble keeping his arms up. So, Aaron and Hur got him a rock to sit on and sat on either side of him lifting up his arms. They stayed this way until sundown, and thus Joshua's men were able to kick the asses of Amalek's army.

After Joshua's army had utterly destroyed Amalek's, God told Moses to write down what had happened there, because he was going to make sure Amalek's entire civilization was utterly erased from history (other than, presumably, the history he had just asked Moses to write).

Moses then built an altar and called the place Jehovahnissi, which translates to, "place where Moses got really sore arms and God promised to totally annihilate an entire nation."