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.
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Augustine of Hippo
For why would the Lord instruct them to kill a sheep on this very feast day except that it was he about whom it was prophesied: “As a sheep is led to the slaughter.” The doorposts of the Jews were marked with the blood of a slaughtered animal. Our foreheads are marked with the blood of Christ. And that sign, because it was a sign, was said to keep the destroyer away from the houses marked with the sign. The sign of Christ drives the destroyer away from us insofar as our heart receives the Savior.
Moses caused the doorposts of the Israelites to be signed with the blood of a lamb; but you have given us a sign, the blood itself of a Lamb without blemish, slain for the sin of the world. Ezekiel says that a sign was given on the foreheads of the persons.
Now if its type had so much power, both in the temple of the Hebrews and in the midst of the Egyptians, when sprinkled on the doorposts, how much more power does the reality have. In its types this blood sanctified the golden altar. Without it, the High Priest did not dare to enter the sanctuary. This blood has ordained priests. In its types it has washed away sins. And if it had such great power in its types, if death shuddered so much at the figure, how would it not even more so be in terror of the reality itself, pray tell? Homilies on the Gospel of John
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 des...