Cambridge Greek Testament Commentary
2 Corinthians 1 - Introduction
The title of the Epistle exists in different forms, none of which is original. The earliest form is the simplest; πρὸς κορινθίους β (אABK): other forms are πρὸς κορ. δευτέρα ἐπιστολή (121, 123), τοῦ ἁγίου� (L), παύλου�. δευτέρα (122): and other variations.