1. The contents of reasoning daily in the school of Tyrannus for two years: Jesus is the Christ (Acts 19:8-10)
    Acts 17:2-3, Acts 18:4-5, Acts 26:22-23, Acts 28:23,30-31

Paul gathered his disciples apart and preached on the Old Testament daily for two years in the school of Tyrannus. Paul preached that the Old Testament describes Christ and that the Christ is Jesus. (Acts 19:8-10)

Acts 19:8 And he went into the synagogue, and spake boldly for the space of three months, disputing and persuading the things concerning the kingdom of God.
9 But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus.
10 And this continued by the space of two years; so that all they which dwelt in Asia heard the word of the Lord Jesus, both Jews and Greeks.

As Paul explained the Old Testament throughout his life, he testified that the Christ prophesied in the Old Testament was Jesus. (Acts 17:2-3, Acts 18:4-5, Acts 26:22-23, Acts 28:23,30-31)

Acts 17:2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,
3 Opening and alleging, that Christ must needs have suffered, and risen again from the dead; and that this Jesus, whom I preach unto you, is Christ.

Acts 18:4 And he reasoned in the synagogue every sabbath, and persuaded the Jews and the Greeks.
5 And when Silas and Timotheus were come from Macedonia, Paul was pressed in the spirit, and testified to the Jews that Jesus was Christ.

Acts 26:22 Having therefore obtained help of God, I continue unto this day, witnessing both to small and great, saying none other things than those which the prophets and Moses did say should come:
23 That Christ should suffer, and that he should be the first that should rise from the dead, and should shew light unto the people, and to the Gentiles.

Acts 28:23 And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening.
30 And Paul dwelt two whole years in his own hired house, and received all that came in unto him,
31 Preaching the kingdom of God, and teaching those things which concern the Lord Jesus Christ, with all confidence, no man forbidding him.