Acts 15:36-39

36 But after certain days Paul said to Barnabas, Let us return now and visit the brethren in every city where we have announced the word of the Lord, [and see] how they are getting on.

37 And Barnabas proposed to take with [them] John also, called Mark;

38 but Paul thought it not well to take with them him who had abandoned them, [going back] from Pamphylia, and had not gone with them to the work.

39 There arose therefore very warm feeling, so that they separated from one another; and Barnabas taking Mark sailed away to Cyprus;