This letter is mentioned in 2 Corinthins 2:3-4. There evidently was some serious trouble in the church which Paul had to address with some serious 'telling off'. We do not have details of this letter or its name, just allusions to it.
A:
Colossians 4:16 mentions an otherwise unknown epistle as written by Paul from Laodicea. The letter from Laodicea is, of course, not in The Bible.
Strictly speaking, however, we should not consider this a letter written by Paul, since the majority of New Testament scholars believe that the Epistle to the Colossians was written in Paul's name decades after his death. The real author of Colossians could have mentioned a non-existent epistle in order to authenticate Colossians in the minds of his readers.
Kenneth J. Foreman has written: 'The Letter of Paul to the Romans/the First Letter of Paul to the Corinthians/the Second Letter of Paul to the Corinthians (The Layman's Bible Comment)'
The earliest letter in the bible is the Letter by Paul to the church in Corinth.
Paul Ellingworth has written: 'A translator's handbook on Paul's letters to the Thessalonians' -- subject(s): Bible, Translating 'A handbook on Paul's letters to the Thessalonians' -- subject(s): Bible, Translating 'A translator's handbook on Paul's first letter to the Corinthians' -- subject(s): Bible, Commentaries, Translating 'A handbook on Paul's first letter to the Corinthians' -- subject(s): Bible, Commentaries, Translating
Ephesians is a letter written to the Christians at Ephesus by Paul.
One example of a letter in the Bible is the Letter to the Romans, written by the apostle Paul to the Christian community in Rome. This letter addresses theological concepts and provides guidance on living out the Christian faith.
Philippians is an epistle, that is, a letter, written by Paul to the church at Philippi about 62 AD.
Pat Edwin Harrell has written: 'The letter of Paul to the Philippians' -- subject(s): Bible, Commentaries
The book of Phillippians was written by Paul in prison.
John Samuel Ruef has written: 'Paul's first letter to Corinth' -- subject(s): Bible, Commentaries
Paul Zilonka has written: 'Romans' -- subject(s): Bible, Meditations
The letter was written about 56 C.E. from Corinth.
Larry Paul Jones has written: 'The symbol of water in the Gospel of John' -- subject(s): Bible, Criticism, interpretation, Symbolism in the Bible, Water in the Bible