Acts 9:20-22

20And immediately he began proclaiming Jesus in the synagogues, saying, “This Man is the Son of God [the promised Messiah]!”

21All those who heard him continued to be amazed and said, “Is this not the man who in Jerusalem attacked those who called on this name [of Jesus], and had come here [to Damascus] for the express purpose of bringing them bound [with chains] before the chief priests?”

22But Saul increased in strength more and more, and continued to perplex the Jews who lived in Damascus by examining [theological evidence] and proving [with Scripture] that this Jesus is the Christ (the Messiah, the Anointed).