And certain men came down from Judea and taught the brethren, “Unless you are circumcised according to the custom of Moses, you cannot be saved.” 2 Therefore, when Paul and Barnabas had no small dissension and dispute with them, they determined that Paul and Barnabas and certain others of them should go up to Jerusalem, to the apostles and elders, about this question.
3 So, being sent on their way by the church, they passed through Phoenicia and Samaria, describing the conversion of the Gentiles; and they caused great joy to all the brethren. 4 And when they had come to Jerusalem, they were received by the church and the apostles and the elders; and they reported all things that God had done with them. 5 But some of the sect of the Pharisees who believed rose up, saying, “It is necessary to circumcise them, and to command them to keep the law of Moses.” — Acts 15:1-5.
Certain men come down from Judea and wrongly teach the brethren that circumcision is necessary for salvation. Paul and Barnabas dissent and dispute with the false teachers. They then go to Jerusalem to discuss this with the apostles and the elders. On the way there, through Phoenicia and Samaria, they relate the wonder of the conversion of the Gentiles, to the great joy of their Christian hearers. In Jerusalem, they encounter believing Pharisees who erroneously teach that circumcision and observance of the law of Moses are necessary for salvation.