2 Timothy 3:16 is more than sufficient.
Uh, no. At the point in time that Paul wrote this, "scripture" referred ONLY to the "Old Testament". There was no "New Testament".
The OT certainly is "teaching, rebuking, correcting and training in righteousness".......but not for salvation, as Paul also taught exhaustively in many places (the OT is about "the Law (of Moses)"...the NT is about salvation)