3 On the tenth day of this month, every family must select an unblemished, first-year, male lamb or goat. 6 On the evening of the fourteenth day, kill the animal and wipe some of its blood on the sides and top of the door posts.
12 I will pass through Egypt, killing all the firstborn men and animals. 13 As I pass over Egypt, I'll see the blood on your door posts, and I'll pass over you. That way I'll know not to kill your firstborn men or animals.
Passover laws
God continued his speech, saying,
14 This day shall be a memorial to you. You must keep it by law forever.
15 For seven days you must eat unleavened bread, and you must remove all leaven from your houses.
Whoever eats leaven bread during this time must be cut off from Israel.
16 There will be holy convocations on the first and seventh days.
32 And take all your children and animals with you. Leave now and bless me, too.
35 The Israelites, following Moses and God's instructions, stole jewels and clothing from the Egyptians.
The Israelites begin their Exodus from Egypt
37-39 The Israelites left Egypt, with 600,000 men, a multitude of farm animals, and lots of unleavened bread. (They didn't have time to make it leavened, since they were in such a hurry.)
43-51 More Passover laws (because you can never have too many)
A few more words about this episode
So that I can show off all my signs and wonders (11:9)
God explains to Moses that he has been hardening Pharaoh's heart so that Pharaoh will not let the Israelites go.
God says that this way he'll be able to show off his signs and wonders (by murdering little children and killing animals).
I'll see the blood on your door posts, and I'll pass over you. (12:13)
God tells the Israelites to smear some blood on their doors. That way when he's going around killing Egyptian children, he'll remember not to kill their children too.
He probably said to himself when he saw the blood, "Oh yeah, I remember now. I'm not supposed to kill the children in this house."
At midnight, God killed all the firstborn children and livestock in Egypt. (12:29)
The Israelites went from a population of only seventy (Exodus 1:5) to several million (600,000 men) in a few hundred years.
If there were 3 million Israelites marching rows of families with an average of five members with a meter between the rows, the column would have stretched 600 km -- which is more than the distance between Goshen and Jerusalem.