And they shall take of the blood, and put it on the two side posts and on the upper door post of the houses, in which they shall eat it.
All Commentaries on Exodus 12:7 Go To Exodus 12
Martin of Braga
The sacrifice of this lamb was so great that even the shadow of its truth was sufficient for salvation in freeing the Jews from the slavery of Pharaoh, as though already the liberation of the creature from the slavery of corruption was prefigured, the image of Christ’s coming passion worked for the advent of salvation. Therefore it was declared by God that in the first month of the year on the fourteenth day of the moon, a yearold lamb without blemish should be sacrificed. With its blood they were to make signs upon the doorposts of their houses, lest they be frightened by the angel of destruction. And on that very night when the lamb was eaten in their homes, which was the celebration of the Passover, they should receive liberation through the figure of slavery. It is not difficult to interpret the spotless lamb of Christ and his sacrifice made to free the slavery of our death. For, marked by the sign of his cross as by the sprinkling of blood, we shall be saved from the angels of destruction even to the consummation of the world.