1 Corinthians 16
22 If anyone does not love the Lord Jesus Christ, let him be accursed. O Lord, come!
Galatians 1
7 which is not another; but there are some who trouble you and want to pervert the gospel of Christ. 8 But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. 9 As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed.
When somebody is instructed, and shown over and over and over, just how many times should it go on before rebuke is handed out?
Acts 13
8 But Elymas the sorcerer (for so his name is translated) withstood them, seeking to turn the proconsul away from the faith. 9 Then Saul, who also is called Paul, filled with the Holy Spirit, looked intently at him 10 and said, “O full of all deceit and all fraud, you son of the devil, you enemy of all righteousness, will you not cease perverting the straight ways of the Lord?
As John W says, the book is full of details. Peter restored sight in Israel. Paul blinded them. It's not hard to see the symbolism.