Men and brethren, children of the stock of Abraham, and whosoever among you feareth God, to you is the word of this salvation sent. For they that dwell at Jerusalem, and their rulers, because they knew him not, nor yet the voices of the prophets which are read every sabbath day, they have fulfilled them in condemning him. And though they found no cause of death in him, yet desired they Pilate that he should be slain. Acts 13:26-28
While Paul and some other Christians were visiting a synagogue on a Sabbath, they asked Paul to speak, here Paul lays out how the entire Old Testament lines up with Jesus. He talks about how God choose Israel to be his people, and he talked about how Israel demanded a King be put over them, so God choose David and how Christ is from the line of David
Paul then says this Jesus, who you read about every Sabbath in your Torah, is the one you had crucified! Now imagine the response Paul is going to get from this crowd, he accused of Israel of killing their own Messiah
And when they had fulfilled all that was written of him, they took him down from the tree, and laid him in a sepulchre. But God raised him from the dead: And he was seen many days of them which came up with him from Galilee to Jerusalem, who are his witnesses unto the people. Acts 13:29-31
Paul then preaches the gospel message, Christ died for our sins, then Christ has risen from the dead. Notice Paul said there were many eye witnesses to the risen Lord. Its important to understand that, the Apostles who made the New Testament , were eyewitnesses to the Risen Jesus
And we declare unto you glad tidings, how that the promise which was made unto the fathers, God hath fulfilled the same unto us their children, in that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee. And as concerning that he raised him up from the dead, now no more to return to corruption, he said on this wise, I will give you the sure mercies of David. Acts 13:32-34
“And we declare unto you good news (the gospel” ) Paul was preaching the gospel of Jesus Christ , and then it was backing it up with reference to prophecies in the Old Testament (Psalm 2:7) God the Father declared he has a Son Jesus Christ and prophesied about the resurrection. The Holy One will never see decay, meaning the Christ will not remain dead but be Risen
Paul is tying together the Old and New Testaments. Paul is demonstrating Jesus is the Messiah (Christ) that has been prophesied about throughout the Old Testament and Jesus Is Risen Amen!