Exodus 11-13

There is yet one more plague, the death of the firstborn.  Every firstborn will be killed, even the firstborn of the animals.  Moses tells this to Pharaoh and leaves.  He apparently left "in hot anger".  I wonder why Moses was so angry.  Probably because Pharaoh had been so hard-hearted and refused to listen thus far.

The Passover meal is explained.  This is the meal they eat when the Lord passes over them and does not kill their firstborn.  When the blood on the doorposts is seen, the Lord passes over and does not kill the firstborn in that house.  They are also to keep eating this Passover meal every year.  This way, it is remembered and explained to the generations to come.

Well, all the firstborn are killed and Pharaoh finally tells them to go.  They leave quickly, not even allowing the dough to rise.  This is why, as explained, they eat unleavened bread in part of their observances.  The firstborn is also consecrated to the Lord.  They all belong to the Lord, and are required to be "bought back" or "redeemed".

As they travel, the Lord appears to them as a cloud by day and as a pillar of fire by night.  They take Joseph's bones because he made the people swear to bring his bones with them when they left Egypt.