Acts 18 records Paul’s first visit to Corinth. Understanding Paul’s relationship to the Corinthian church is crucial to understanding his letters to Corinth.
In Acts 16, when Luke reports on the conversion of two locals, he tells us that Paul baptized their entire households. Why would Paul baptize an entire household?
Though he is uncelebrated by history, without Barnabas — you could argue — there would have been no Apostle Paul, no John Mark and no Gospel of Mark.