Acts 15:39

And the contention was so sharp between them
About this matter; Barnabas insisting on it, that John Mark should go with them, he being a relation of his; and in whose favour it might be urged, that his mother Mary was an excellent good woman, who had received the saints into her house, in a time of persecution; and that it should be considered, that this her son was but a young man, and could not be thought to have that courage, resolution, constancy, and solidity, as older professors and ministers; and that his crime was not very heinous, and should be overlooked. Paul, on the other hand, opposing his going with them, as a very unworthy person, because he had behaved so cowardly, and had shown such a coldness and indifference to the work of the ministry, and had so shamefully left them; and thus they disputed the point till there was a paroxysm between them, as is the word used: they were irritated and provoked by one another, and were so warmed and heated on both sides,

that they departed asunder one from another;
thus as soon almost as peace was made in the church, a difference arises among the ministers of the word, who are men of like passions with others; and though it is not easy to say which was to blame most in this contention; perhaps there were faults on both sides, for the best men are not without their failings; yet this affair was overruled by the providence of God, for the spread of his Gospel, and the enlargement of his interest; for when these two great and good men parted from one another, they went to different places, preaching the word of God:

and so Barnabas took Mark and sailed unto Cyprus;
(See Gill on Acts 13:4).