Galatians 2

Fourteen years after his conversion, Paul went to Jerusalem with Barnabas and Titus. By taking Titus, an uncircumcised Gentile, he publicly decided the question between Gentiles and the Judaizing Christians, setting aside circumcision for the Gentiles as a means of life.
He went there by revelation, guided by the Spirit of God, to communicate the gospel which he had previously preached to the Gentiles. There were false brethren present who were disrupting the assembly, to whom Paul gave no place. They seemed to be important, but Paul ignored them.
The leading apostles in Jerusalem gave the right hand of fellowship to Paul, having perceived the grace given to him. Paul had in laboring those fourteen years found many converts and formed assemblies. No one could deny this.
They all agreed that the apostles should remain at Jerusalem except Paul who should go to the heathen. Their desire was that all should remember the poor.
When Paul was at Antioch and Peter was present, Paul confronted him about his action of still separating from the Gentiles. Barnabas was also led away by it. Peter was thus rebuked by Paul for not being consistent with the gospel he preached that salvation by faith was for all.