Acts 15:36-39

And after some days Paul said unto Barnabas, Let us return now and visit the brethren in every city wherein we proclaimed the word of the Lord, and see how they fare. And Barnabas was minded to take with them John also, who was called Mark. But Paul thought not good to take with them him who withdrew from them from Pamphylia, and went not with them to the work. And there arose a sharp contention, so that they parted asunder one from the other, and Barnabas took Mark with him, and sailed away unto Cyprus