Acts 15:2

15:2 When Paul and Barnabas had a major argument and debate with them, the church appointed Paul and Barnabas and some others from among them to go up to meet with the apostles and elders in Jerusalem about this point of disagreement.

Acts 15:39

15:39 They had a sharp disagreement, so that they parted company. Barnabas took along Mark and sailed away to Cyprus,