Exodus 12:46

And that prophecy also is fulfilled, "A bone of Him shall not be broken." (Ex. xii. 46; Num. ix. 12.) For even if this was said with reference to the lamb of the Jews, still it was for the sake of the reality that the type preceded, and in Him the prophecy was more fully accomplished. On this account the Evangelist brought forward the Prophet. For since by continually producing himself as witness he would have seemed unworthy of credit, he brings Moses to help him, and saith, that neither did this come to pass without a purpose, but was written before of old. And this is the meaning of the words, "A bone of Him shall not be broken."

Now next, that the legs of those two were broken, while his [Christ's] were not. He was already dead. Why this happened was stated in the Gospel itself. It was fitting, you see, to demonstrate by this sign as well that the true point and purpose of the Jewish Passover, which contained this instruction, not to break the lamb's bones, was to be a prophetic preenactment of his death.

God says, "In one house shall it be eaten; you shall not cast the flesh abroad out of the house." The flesh of Christ and the holy thing of the Lord cannot be cast out. The faithful have no home but the one church. This home, this house of unanimity, the Holy Spirit announces unmistakably in the Psalms: "God who makes men to dwell together of one mind as in a house."

For the faith of the sacred Scripture sets forth that the Church is not without, nor can be separated nor divided against itself, but maintains the unity of an inseparable and undivided house; since it is written of the sacrament of the passover, and of the lamb, which Lamb designated Christ: "In one house shall it be eaten: ye shall not carry forth the flesh abroad out of the house." Which also we see expressed concerning Rahab, who herself also bore a type of the Church, who received the command which said, "Thou shalt bring thy father, and thy mother, and thy brethren, and all thy father's household unto thee into thine house; and whosoever shall go out of the doors of thine house into the street, his blood shall be upon him." In which mystery is declared, that they who will live, and escape from the destruction of the world, must be gathered together into one house alone, that is, into the Church; but whosoever of those thus collected together shall go out abroad, that is, if any one, although he may have obtained grace in the Church, shall depart and go out of the Church, that his blood shall be upon him; that is, that he himself must charge it upon himself that he perishes; which the Apostle Paul explains, teaching and enjoining that a heretic must be avoided, as perverse, and a sinner, and as condemned of himself. For that man will be guilty of his own ruin, who, not being cast out by the bishop, but of his own accord deserting from the Church is by heretical presumption condemned of himself.

All such efforts are only of use when they are made within the church's pale. We must celebrate the Passover in the one house. We must enter the ark with Noah. We must take refuge from the fall of Jericho with the justified harlot, Rahab.