It is written that the Christ would suffer and on the third day rise from the dead
The disciples told their story of what had happened on the road and how they had recognised Jesus at the breaking of bread.
They were still talking about all this when Jesus himself stood among them and said to them, ‘Peace be with you!’ In a state of alarm and fright, they thought they were seeing a ghost. But he said, ‘Why are you so agitated, and why are these doubts rising in your hearts? Look at my hands and feet; yes, it is I indeed. Touch me and see for yourselves; a ghost has no flesh and bones as you can see I have.’ And as he said this he showed them his hands and feet. Their joy was so great that they still could not believe it, and they stood there dumbfounded; so he said to them, ‘Have you anything here to eat?’ And they offered him a piece of grilled fish, which he took and ate before their eyes.
Then he told them, ‘This is what I meant when I said, while I was still with you, that everything written about me in the Law of Moses, in the Prophets and in the Psalms has to be fulfilled.’ He then opened their minds to understand the scriptures, and he said to them, ‘So you see how it is written that the Christ would suffer and on the third day rise from the dead, and that, in his name, repentance for the forgiveness of sins would be preached to all the nations, beginning from Jerusalem. You are witnesses to this.’
Source: Jerusalem Bible
Catechism of the Catholic Church
The Meaning And Saving Significance Of The Resurrection
651 “If Christ has not been raised, then our preaching is in vain and your faith is in vain.” The Resurrection above all constitutes the confirmation of all Christ’s works and teachings. All truths, even those most inaccessible to human reason, find their justification if Christ by his Resurrection has given the definitive proof of his divine authority, which he had promised.
652 Christ’s Resurrection is the fulfillment of the promises both of the Old Testament and of Jesus himself during his earthly life. The phrase “in accordance with the Scriptures” indicates that Christ’s Resurrection fulfilled these predictions.
653 The truth of Jesus’ divinity is confirmed by his Resurrection. He had said: “When you have lifted up the Son of man, then you will know that I am he.” The Resurrection of the crucified one shows that he was truly “I AM”, the Son of God and God himself. So St. Paul could declare to the Jews: “What God promised to the fathers, this he has fulfilled to us their children by raising Jesus; as also it is written in the second psalm, ‘You are my Son, today I have begotten you.'” Christ’s Resurrection is closely linked to the Incarnation of God’s Son, and is its fulfillment in accordance with God’s eternal plan.
654 The Paschal mystery has two aspects: by his death, Christ liberates us from sin; by his Resurrection, he opens for us the way to a new life. This new life is above all justification that reinstates us in God’s grace, “so that as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life.” Justification consists in both victory over the death caused by sin and a new participation in grace. It brings about filial adoption so that men become Christ’s brethren, as Jesus himself called his disciples after his Resurrection: “Go and tell my brethren. “We are brethren not by nature, but by the gift of grace, because that adoptive filiation gains us a real share in the life of the only Son, which was fully revealed in his Resurrection.
655 Finally, Christ’s Resurrection – and the risen Christ himself is the principle and source of our future resurrection: “Christ has been raised from the dead, the first fruits of those who have fallen asleep. . . For as in Adam all die, so also in Christ shall all be made alive.” The risen Christ lives in the hearts of his faithful while they await that fulfillment . In Christ, Christians “have tasted. . . the powers of the age to come” and their lives are swept up by Christ into the heart of divine life, so that they may “live no longer for themselves but for him who for their sake died and was raised.”
For the leader; with stringed instruments. A psalm of David.
Answer when I call, my saving God. In my troubles, you cleared a way; show me favor; hear my prayer.
How long will you people mock my honor, love what is worthless, chase after lies? Selah
Know that the LORD works wonders for the faithful; the LORD hears when I call out.
Tremble and do not sin; upon your beds ponder in silence.
Offer fitting sacrifice and trust in the LORD.
Many say, “May we see better times! LORD, show us the light of your face!” Selah
But you have given my heart more joy than they have when grain and wine abound.
In peace I shall both lie down and sleep, for you alone, LORD, make me secure.
Source: The New American Bible