Paul was the first person to be saved under the grace dispensation. Here is my argument
Mark 3:28-29 (NLT) 28 “I tell you the truth, all sin and blasphemy can be forgiven, 29 but anyone who blasphemes the Holy Spirit will never be forgiven. This is a sin with eternal consequences.”
One might be curious, at least I was, on how exactly Saul was saved. If the Jews that stoned Stephen, blasphemed against the Holy Spirit, which Jesus said was an unforgivable sin, how in the world can God justify Saul? Remember, Paul was consenting to the stoning of Stephen. The latter was full of the Holy Spirit. By rejecting and stoning him, Paul was actually also committing blasphemy of the Holy Spirit.
I believed the dispensation of grace began during Stephen’s stoning. Under the grace dispensation, there is no longer any unforgivable sin. Jesus’s proclamation of the unforgiveable sin was under the law dispensation, and when God decided to save Saul, he could do that righteously because of the change in dispensation.
The key verse is what Paul reflected in his letter to Timothy,
1 Timothy 1:15-16 New King James Version (NKJV)
15 This is a faithful saying and worthy of all acceptance, that Christ Jesus came into the world to save sinners, of whom I am chief. 16 However, for this reason I obtained mercy, that in me first Jesus Christ might show all longsuffering, as a pattern to those who are going to believe on Him for everlasting life.
A pattern is the first of more to come. Paul is the “pattern” for us members of the Church, the Body of Christ; the Apostle Paul being the “pattern” means he was the first member of the Church, the Body of Christ. He was the first to be saved under the dispensation of grace. Even though he blasphemed against the Holy Spirit, he was forgiven because the dispensation has changed into grace.
Thus, the Gospel of Grace by which we were and are saved now, is the same Gospel message that saved the Apostle Paul. In short, after the stoning of Stephen, the gospel of the kingdom was put on hold, and the gospel of grace became the gospel of which everyone is to be saved under.
This was confirmed by Peter's proclamation at the Jerusalem council in Act 15
11 But we believe that through the grace of the Lord Jesus Christ we shall be saved, even as they.
This proclamation, by Peter, is very significant to me. The Council was first discussing that the Gentiles must be saved "as the Jews are", which is thru Mosaic Law.
But now, Peter is saying, the Jews must now be saved "as the Gentiles are".