2 Corinthians   The Second Epistle of Paul the Apostle to the Corinthians    2 Corinthians 1:1 Paul, an apostle of Jesus Christ by the will of God,  and Timothy our brother, unto the church of God which is  at Corinth, with all the saints which are in all Achaia: 

1 Corinthians 1:1 Paul, called to be an apostle of Jesus Christ  through the will of God, and Sosthenes our brother.