Peter said to them, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of sins, and you shall receive the gift of the Holy Spirit.
Therefore I make known to you that no one speaking by the Spirit of God says, “Jesus be cursed!” And no one can say, “Jesus is the Lord,” except by the Holy Spirit.
Figuratively this is like baptism, which also saves us now. It is not washing off the dirt from the body, but a response to God from a good conscience through the resurrection of Jesus Christ,
Whoever believes in the Son of God has this witness in himself. Whoever does not believe God has made Him out to be a liar, because he does not believe the testimony that God gave about His Son.