Luke
Acts 15:38ESV·traditional attribution

But Paul thought best not to take with them one who had withdrawn from them in Pamphylia and had not gone with them to the work.

Matthew Henry Presbyterian @wholebiblehenry

We have seen one unhappy difference among the brethren, which was of a public nature, brought to a good issue; but here we have a private quarrel between two ministers, no less men than Paul and Barnabas, not compromised indeed, yet ending well. I.

Commenting on Acts 15:36-41

John Gill Reformed Baptist @doctorgill

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...

Albert Barnes Presbyterian @notesbybarnes

Verse 38. But Paul thought not good. Did not think it proper. Because he could not confide in his perseverance with them in the toils and perils of their journey. Who departed from them, etc. . Why he did this is not known. It was evidently, however, for some cause which Paul did not consider satisfactory, and which, in his view, disqualified him from being their attendant again.