What did the blood on the doorposts picture?
The blood applied to the two side posts and the top of the door pictured the outline of the cross. In the mind's eye, it formed the shape of the cross, which God had in mind, pointing to Christ our Passover sacrificed for us.
Les explains that the Passover in Egypt involved blood on the doorposts—two side posts and one on the top. He asks what happened on the doorposts and says that in your mind's eye you can picture the outline of the cross, and he is sure that is what God had on His mind. This connects to Paul's analogy that Christ our Passover is sacrificed for us. The context also shows that the following seven days of unleavened bread pictured a nation whose sins had been atoned for or cleansed, and believers are unleavened, forgiven, cleansed, and without sin so far as God is concerned. The leaven warns that sin left in individual lives or the church will expand and consume.
And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it.
And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt.
More Questions
What did the Israelites use to put the blood on the door posts and lintel?
They applied the blood on the door of their little slave hut in Egypt with a piece of hyssop, which was like our ragweed, putting it on the two door posts and on the lintel or headboard.