Exodus 12
In this chapter God is doing two things: He is preparing the Israelites to leave Egypt (and in somewhat of a hurry) and He is giving them instructions for the annual celebration of this deliverance, Passover. It is called Passover because the Israelites were to spread some of the blood from the sacrificial lamb on their door frames, and when God enacted His last plague, which was to kill all of the firstborn sons in Egypt, He would know to “pass over” the houses with the blood, sparing the Israelite families. Very specific instructions (foreshadowing the Law given to Moses in a few chapters) for observing Passover are given, including the beginning of a yearly religious calendar for the Jewish people. Every aspect of the observance had significance, especially the lack of yeast in the bread; this represents the idea that the Israelites had to leave Egypt in such a hurry, that they didn’t have time to add yeast to the bread they were making.
Moses passes all of the instructions to the Israelites, and during the appointed night, God killed all of the firstborn sons of Egypt, passing over the houses of the Israelites. Angry, Pharaoh tells Moses not only to take the Israelites into the desert, but to get them out of the country! The Israelites do so, and in a hurry, but not without asking their Egyptian neighbors for their gold, silver, and clothing, which was God’s way of allowing the Israelites to plunder the Egyptians. In this way, God rescued His people from Egypt (and gives this book it’s name). The chapter ends with a few more instructions about the observance of Passover.