Barnes New Testament Notes

Verse 20. And straightway. Immediately. This was an evidence of the genuineness of his conversion, that he was willing at once to avow himself to be the friend of the Lord Jesus.

He preached Christ. He proclaimed and proved that Jesus was the Christ. See Ac 9:22. Many manuscripts read here Jesus instead of Christ. Griesbach has adopted this reading. Such is also the Syriac, the Vulgate, and the Ethiopic. This reading accords much better with the subject than the common reading. That Christ, or the Messiah, was the Son of God, all admitted. In the New Testament the names Christ and Son of God are used as synonymous. But the question was, whether Jesus was the Christ, or the Son of God, and this Paul showed to the Jews. Paul continued the practice of attending the synagogues; and in the synagogues any one had a right to speak, who was invited by the officiating minister. Ac 13:15.

That he is the Son of God. That he is the Messiah.

{+} "straitway" "immediately"