Then he took unto him the twelve, and said unto them,
Behold, we go up to Jerusalem, and all things that are written by the prophets concerning the Son of man shall be accomplished.
Read Chapter 18
Bede
AD 735
And knowing that there would arise certain heretics, saying, that Christ taught things contrary to the Law and the Prophets, He shows already that the voices of the Prophets had proclaimed the accomplishment of His Passion, and the glory which should follow.
For because they desired His life above all things, they could not hear of His death, and as they knew him to be not only a spotless man, but also very God, they thought He could in no wise die. And whenever in the parables, which they frequently heard Him utter, He said any thing concerning His Passion, they believed it to be spoken allegorically, and referred to something else. Hence it follows, And this saying was hid; from them, neither knew they the things which were spoken. But the Jews, who conspired against His life, knew that He spoke concerning His Passion, when he said, The Son of man must be lifted up; therefore said they, We have heard in our law that Christ abides for ever, and how say you the Son of man must be lifte...
To prepare the disciples’ minds, the Savior of all tells them that he will suffer the passion on the cross and death in the flesh as soon as he has gone up to Jerusalem. He added that he would also rise wiping out the pain and obliterating the shame of the passion by the greatness of the miracle. It was glorious and worthy of God to be able to break the bonds of death and hurry back to life. According to the expression of wise Paul, the resurrection from the dead testifies that he is God and the Son of God. Commentary on Luke, Homily
The Savior of all then declared these things beforehand to the holy apostles. It says, “They did not understand what was said, and the word was hid from them.” They did not then know accurately what the holy prophets proclaimed. Although [Peter] who was first among the disciples heard the Savior once say that he should be crucified, die and arise, he did not yet understand the depth of the mystery. He resisted, saying: “Far be that from you, Lord. This will not happen to you.” He was rebuked for speaking this because he did not know the meaning of the relevant Scripture inspired by God. When Christ arose from the dead, he opened their eyes, as another of the holy Evangelists wrote. They were enlightened, being enriched with the abundant participation of the Spirit. Commentary on Luke, Homily
He told them beforehand what would happen so that they might be aware that he foreknew his passion. Although it was in his power easily to escape, Christ still went ahead to willingly meet it. Saying, “Behold, we go up to Jerusalem,” he urgently testified and commanded them to remember what had been foretold. He necessarily added that the holy prophets had foretold all these things. As in the person of Christ, Isaiah says, “I have given my back to scourging, and my cheeks to buffetings; and I have not turned away my face from the shame of spitting.” In another place, the prophet says of him, “As a sheep he was led unto the slaughter, and was silent, as a lamb before its shearer.” “All we like sheep have gone astray: every one has gone astray in his path, and the Lord has delivered him up because of our sins.” In the twentysecond psalm, blessed David, painting as it were beforehand the sufferings upon the cross, set before us Jesus speaking as one already hanging on the tree. He says, “...
And to convince them that He foreknew His Passion, and of His own accord came toit, that they might not say, “How has He fallen into the hands of the enemy, who promised us salvation?” He relates in order the successive events of the Passion; He shall be delivered to the Gentiles, and shall be mocked, and scourged, and spitted on.
The disciples did not as yet know exactly what the Prophets had foretold, but after He rose again, He opened their understanding that they should understand the Scriptures.
I marvel at the folly of those who ask how Christ rose again before the three days. If indeed He rose later than he had foretold, it were a mark of weakness, but if sooner, a token of the highest power. For when we see a man who has promised his creditor that he will pay him his debt after three days, fulfilling his promise on that very day, we are so far from looking upon him as deceitful, that we admire his veracity. I must add, however, that He said not that He should rise again after three days, but on the third day. You have then the preparation, the Sabbath until sun set, and the fact that He rose after the Sabbath was over.
He speaks with His disciples apart, concerning His Passion. For it was not fitting to publish this word to the multitudes, lest they should be troubled, but to His disciples He foretold it, that being habituated by expectation, they might be the more able to bear it.
Esaias prophesied of this when he said, I gave my back to the smiters, and my cheeks to them that plucked off the hair: I hid not my face from shame and spitting. The Prophet also foretold the crucifixion, saying, He has poured out his soul to death, and was numbered with the transgressors; as it is said here, And after they have scourged him, they shall put him to death. But David foretold Christ's resurrection, For you shall not leave my soul in hell, and so it is here added, And on the third day he shall rise again.