Where else did Paul defend his apostleship as he does in Galatians?
The context identifies the Corinthian letters as the other place where Paul defended his apostleship. It states that in Galatians he is still defending his apostleship, just as he did all through the Corinthian letters. No other letters are named in this transcript.
Les teaches that the Apostle Paul is still defending his apostleship in Galatians, just as he did all through the Corinthian letters. This defense arises because the Galatian churches were being bombarded with a perversion of the Gospel—adding law, legalism, and works to Paul's Gospel of Grace. The Corinthian letters are cited as another example where Paul defended his apostolic authority against similar challenges.