Thematic Bible: Paul and barnabas contend concerning

Then after some days Paul suggested to Barnabas, "Let us go back and visit the brothers in all the towns where we proclaimed the message of the Lord, to see how they are doing." Barnabas [agreed, and] wanted to take John Mark [his cousin, See Col. 4:10] with them. But Paul was not at all in favor of taking someone who had left them and refused to continue on in the work [of preaching the Gospel] when they were in Pamphylia. [See 13:13]. read more.
A heated discussion developed [over this matter] so that Paul and Barnabas went their separate ways [over it], with Barnabas sailing for Cyprus and taking [John] Mark with him.