Paul preached the Gospel of GraceThroughFaith which stands completely on its own with no dependence on prior covenants or standards for righteousness.
However, some believers then and now still hang on to performance aspects of the law as requirements for SpiritSalvation. This is error.
Forgiveness of sins is a done deal Heb 8:12.
EternalLife in the NewBirth comes by faith in Christ Jesus Rom 6:23.
We then walk by faith in the Word so that we experience AbundantLife Joh 7:38.
Salvation is two-part: SpiritSalvation and SoulSalvation. -> SpiritSalvation is instantaneous through faith InChrist Jesus. -> SoulSalvation will occur at the return of Christ when we are translated.