This question refers to the sharp contention that the apostles Paul and Barnabas had concerning John Mark at the start of Paul's second missionary journey, recorded in the Acts of the Apostles Ch. 15 & v. 37 to 40.
On their first missionary journey, Paul & Barnabas took John Mark with them, but he turned back at the second port of call, (Acts.13.13). The Bible doesn't say why, but maybe he got a bit scared, because they had plenty of opposition to preaching the Gospel.
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The book that comes after Mark in the Bible is Luke.
Paul is first mentioned in the bible in the book of Acts.
This is all we know about Paul's family. They are not mentioned anywhere else in the Bible.
The Gopsel of Mark was written around by John Mark, one of the apostles of Jesus. It was written around 60-70 A.D. Mark was not a disciple, but he was a companion of Paul on some of his missionary journeys. Others date the book to around 62 A.D.
The apostle Paul wrote Titus. This is the twelfth of the thirteen books by Paul to appear in the Bible.