"I marvel that you are turning away so soon from Him who called you in the grace of Christ, to a different gospel, which is not another; but there are some who trouble you and want to pervert the gospel of Christ. But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed." -- Galatians 1:6-9
"Then the brethren immediately sent Paul and Silas away by night to Berea. When they arrived, they went into the synagogue of the Jews. These were more fair-minded than those in Thessalonica, in that they received the word with all readiness, and searched the Scriptures daily to find out whether these things were so." -- Acts 17:10-11
A godly person, presented with a claim of someone supposedly imparting additional unwritten traditions handed down by the Apostles, has to follow the Biblical mechanism for evaluating such claims. The alleged tradition must be compared to what was taught and written before. If it contradicts, then it must be rejected and the one making the false claim should be "accursed."
Agreed, Sloth - and great post! ALL “tradition” or “revelation” must be tested against Scripture. Sad to see so much confusion in this vital area.