I wonder why some people stress teaching what Paul taught, and rarely mention what Jesus Himself said? I find that interesting......
Christ upon resurrection begins to mediate a new better eternal sin management covenant (Hen 8:6. 9:15).
The risen Christ chooses Paul to preach a message. The new covenant (Order of Melchizedek/spiritual/eternal is tied to the Abrahamic covenant promise (Gen 15:4-5). The Lord made 430 years before the Mosaic (Levitical order/temporal/physical) law covenant is cut at Mt. Sinia.
Paul's message isn't to Israel only, it's to ALL nations.
While Christ is alive His in the flesh/earthly mission is to Jews under the law only.
Gal 4:4 But when [in God’s plan] the proper time had fully come, God sent His Son, born of a woman, born under the [regulations of the] Law
(MY NOTE: Christ born of a woman, born under all Mosaic law regulations. Jesus lived by Mosaic law, faithfully kept all 619 & preached the Law to "Those under the Law")
Not one living person today, Jew or Gentile, has ever been under the old Mosaic law covenant. The temple & Levitical priesthood have been out of operation since 70 AD. Christ is our great High Priest (Heb 4:14).
Scripture doesn't lie:
Matt 4:23 The Lord Jesus went about all Galilee, teaching in their (JEWS) synagogues preaching the gospel of the kingdom,
Matt 10:5 The Lord Jesus sends the 12 & commanded them. Don't! go to Gentiles,
Matt 10:6 The Lord Jesus commands the 12: Only go! To lost sheep of the house of Israel,
Matt 15:24 The Lord Jesus said, He's only been sent to preach to the lost sheep of the house of Israel,
Rom 15:8 Paul teaches, Messiah was sent to preach to the circumcision (JEWS),
Bible study 101: Who is speaking, to whom is he speaking, what is he speaking about. Jesus is speaking to Jews only, about repentance of "returning to God". Not! About confessing every personal sin. Their God given sacrificial system dealt with covered/sins.
Eph 2:12 That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:
(MY NOTE: Pre-Christ's sin atoning death & resurrection ALL gentiles were viewed as impure, godless dogs, WITHOUT HOPE, bastards living outside of covenant seals)
Matt 7:6 The Lord Jesus said, give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.
(MY NOTE: Dogs, swine & gentiles all considered unclean/impure under Mosaic Law)
Matt 15:22-26, Vs 26 Jesus calls the Canaanite/gentile women a DOG!
(ME NOTE: Note: In Jesus [a Jew] day gentiles were considered to be godless & ceremonially unclean. The reference "dog" was a commonly known & used expression within the Jewish culture.
Jn 18:28 Then led they Jesus from Caiaphas unto the (roman/gentile) hall of judgment: and it was early; and they themselves went not into the judgment hall, lest they should be defiled; but that they might eat the Passover.
(MY NOTE: Just being in the gentile Hall of Judgment made a Jew UNCLEAN!)
Acts 10:28 Peter tells Cornelius a gentile. Under Mosaic law (which Jesus taught & faithfully kept) IT'S UNLAWFUL for a Jew to keep company with a gentile. Under Mosaic law gentiles were seen as unclean, bastards outside covenant seals.
We can't broad brush repent & be baptized (OT/covenant doctrine) or confess every sin after conversion. Onto today's (NT/covenant) body of Christ believer.
Claiming Jesus' earthly ministry was to everyone is false! Placing NT believers under Mosaic law ordinances is wrong.
That doesn't mean we can't glean spiritual truths from all scripture:
Rom 15:4 For whatsoever things were written aforetime were written for our learning, that we through patience and comfort of the scriptures might have hope.
MY (NOTE: ALL scripture is written for our LEARNING. ALL scripture isn't written for our DOCTRINE. Example: NT believers aren't required to be circumcised (Acts 15:24) or bring an animal sin sacrifice to Temple Priests)
Scripture cites Salvation is to the Jew 1st & then to the Gentile (Rom 1:16, 2:9-10) From thr H/s outpouring at Pentecost (Acts 2:1-4)
It's been 6 years since the Holy Spirit outpouring at Pentecost. Salvation has only been preached to the Jew only.
Here at the Italian gentile Cornelius house a most wonderful change is happens:
Acts 10:43-44 While Peter spoke the Holy Spirit fell on all of them which heard the word.
(MY NOTE: They Believed (vs43) & as Peter spoke (vs44) The Holy Spirit fell on them (vs45). No repentance of any kind here, No water baptism, No circumcision, they brought no sin sacrifice to the Temple, No law keeping, no sin confessions.
Read Act chapter 10. Peter preached the sin atoning death & resurrection to these Gentiles. And by Faith & faith alone they received Christ baptism with His eternal salvation sealing Holy Spirit. (Eph 1:13, 2 Cor 1:22 & Eph 4:30)
Finally,
The New covenant mediated by Christ today. Is the extension/fulfilment of the unilateral unconditional covenant promise God made to Abraham (Gen 15:4-5). This covenant promise came 430 years before (Gal 3:17) the Mosaic law covenant. And is received thru Faith (Gal 3:14) in a righteous God & not by any righteous works of man.
All praise, glory & honor belong to our Great God & Savior, Jesus the Christ! AMEN & Amen