Acts 15:37 KJV
And Barnabas determined to take with them John, whose surname was Mark.
Acts 15:37, King James Version
In context
36 And some days after Paul said unto Barnabas, Let us go again and visit our brethren in every city where we have preached the word of the Lord, and see how they do.
37 And Barnabas determined to take with them John, whose surname was Mark.
38 But Paul thought not good to take him with them, who departed from them from Pamphylia, and went not with them to the work.