Acts 15:36-38

After some time Paul said to Barnabas, “Let us go back and visit the brothers and sisters (believers) in every city where we preached the message of the Lord, and see how they are doing.” Now Barnabas wanted to take [his cousin] John, who was called Mark, along with them. But Paul kept insisting that they should not take along with them the one who had quit and deserted them in Pamphylia and had not gone on with them to the work.