Fourteen years after] i.e. after his conversion (Galatians 1:16), from which the various subsequent events are dated: cp. Galatians 1:16; Galatians 1:18; Galatians 1:21. Again] There is much difference of opinion as to which of St. Paul's visits to Jerusalem, as recorded in the Acts, he here refers. Many scholars hold that this visit corresponds to that recorded in Acts 15 at the close of the First Missionary Journey. Others, especially Ramsay, identify this visit with that recorded in Acts 11:27-30 and Acts 12:25.
Barnabas was his companion on both occasions. Certainly that mentioned in Acts 11:27-30;—his second visit—was caused by a revelation—that to Agabus—but the third visit (Acts 15), the direct occasion of which was about the Mosaic Law, seems, from what follows, the one to which the Apostle alludes. Barnabas] cp. Acts 4:36-37; Acts 11:22; Acts 13:2. Titus] was perhaps the most trusted of all St. Paul's companions and emissaries. When any specially delicate work had to be done requiring experience and tact, Titus was chosen for the purpose: cp. 2 Corinthians 7:6; 2 Corinthians 8:6; 2 Corinthians 8:17-18, and notes there. It is remarkable that his name is never mentioned in Acts.