Commentary on Mark
The council against Christ was assembled on Wednesday. And this is the reason why we fast on Wednesdays. The enemies wanted to wait until after the feast time, but this was not permitted to them. The Lord, appointing the sufferings for Himself, willed to deliver Himself to the Crucifixion on Pascha itself, for He Himself was the True Pascha. Here one must marvel at His power. For when the enemies wanted to seize Him, they could not, but when they did not want to, on account of the feast, then He Himself willingly delivered Himself to them.
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Catena Aurea by Aquinas
Let us now sprinkle our book, and our thresholds with blood, and put the scarlet thread around the house of our prayers, and bind scarlet on our hand, as was done to Zarah, (Gen. 38:30) that we may be able to say that the red heifer is slain in the valley. (Num. 19:2, Deut. 21:4) For the Evangelist, being about to speak of the slaying of Christ, premises, After two days was the feast of the Passover, and of unleavened bread.
Or else phase is interpreted a passing over, but Pascha means sacrifice. In the sacrifice of the lamb, and the passing of the people through the sea, or through Egypt, the Passion of Christ is prefigured, and the redemption of the people from hell, when He visits us after two days, that is, when the moon is most full, and the age of Christ is perfect, that when no part at all of it is dark, we may eat the flesh of the Lamb without spot, who taketh away the sins of the world, in one house, that is, in the Catholic Church, shod with charity, and armed with virtue.
But iniquity came forth in Babylon from the princes, who ought to have purified the temple and the vessels, and themselves according to the law, in order to eat the lamb. Wherefore there follows: And the Chief Priests and the Scribes sought how they might take him by craft, and put him to death. Now when the head is slain, the whole body is rendered powerless, wherefore these wretched men slay the Head. But they avoid the feast day, which indeed befits them, for what feasting can there be for them, who have lost life and mercy? Wherefore it goes on: But they said, Not on the feast day, lest there be an uproar of the people.
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