And straightway - Immediately. It 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 that Jesus was the Christ. See Acts 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. The 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, and was therefore the Son of God, and this Paul showed to the Jews. Paul continued the practice of attending the synagogues; and in the synagogues anyone had a right to speak who was invited by the officiating minister. See Acts 13:15.
That he is the Son of God - That he is the Messiah.