Acts 15:2

‘And when Paul and Barnabas had no small dissension and questioning with them, the brethren appointed that Paul and Barnabas, and certain other of them, should go up to Jerusalem to the apostles and elders about this question.'

Paul and Barnabas saw to the heart of the question and stood firm against these new teachers, disagreeing with the men and challenging the basis of their teaching and questioning their arguments. Indeed there was a strong and longlasting discussion (‘no small dissension'). But it was finally agreed by the whole church that what was necessary was to go to the Apostles and the mother church in Jerusalem and discover their minds on the subject. They would seek guidance from the source. That would resolve the issue. So the church at Syrian Antioch appointed ‘Paul and Barnabas' and ‘certain other of them' to go up to Jerusalem to the Apostles and the elders of the church in Jerusalem in order to confirm what their view was on the matter. They wanted to be in agreement with their fellow-believers in Jerusalem.