2 Peter 3:16

This is what he says. This implies that Paul is now dead and that Peter has read everything Paul had written. Note that Peter calls their attention to the fact that Paul wrote the very same thing about the Judgment that he is writing!!! Some difficult things. This is not criticism of Paul, but rather of the false teachers who purposely misuse Paul's writings. See Introduction to James. With other passages. Note that Peter includes Paul's writings as part of the Scriptures!!! This certainly proves that at this point in time there was already in existence a body of writings accepted as authentic Scripture - in addition to the Old Testament Scriptures!!!