"After some time had passed, Paul said to
Barnabas, 'Let’s go back and visit the brothers in every town where
we have preached the message of the Lord and see how they’re
doing.' Barnabas wanted to take along John Mark. But Paul did not
think it appropriate to take along this man who had deserted them
in Pamphylia and had not gone on with them to the work. There was
such a sharp disagreement that they parted company, and Barnabas
took Mark with him and sailed off to Cyprus. Then Paul chose Silas
and departed, after being commended to the grace of the Lord by the
brothers. He traveled through Syria and Cilicia, strengthening the
churches" (Acts 15:36-41).