http://www.shellyduffer.com/2013/03/06/blood-on-the-doorposts/
3 Speak ye unto all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of theirfathers, a lamb for an house:….
6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.
7 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.
12 For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the Lord.
13 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.  (Exodus 12:3,6-7, 12-13)
We might ask ourselves, why put blood on the door posts and lintel of the houses?  Why not on the walls or the roof or something like that?

I think it was supposed to teach something about how we get back to our heavenly home by making an earthly parallel.  We know the blood of the lamb represented the blood of Jesus Christ and his sacrifice for us.  The Israelites could only be safe if they went into their home, going through these doors.  In the same way, to return to our heavenly home and gain eternal life and safety, we have to go through Christ.  Christ is the gateway because of his atoning sacrifice.


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