How do the Sola Scrptura folks react to the Dead Sea Scrolls and other more recent discoveries of ancient Biblical texts not among those canonized by Martin Luther?

Just as there are a few discrepancies between the Masoretic and Samaritan Torahs.

Actually, Luther was influenced by the books of the Masoretic Tanakh and did, originally, include the Apocrypha.

Even Jesus questioned how the Messiah was David's son.

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In response to A2A:

The influence of the Christian Old Testament was the Septuagint, which predates Jesus. Luther, also maintained the Septuagint philosophy of law, history, poetry and prophets, in ordering, while the Tanakh followed Torah, prophets (Nevi'im) and writings (Ketuvim).

Since the Bible is a collection of writings (literally what biblia means), you will even find that while Matthew and Luke have genealogies, Paul wrote to Titus and Timothy not to pursue foolish genealogies.

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Nuda Scriptira is scripture alone. Sola Scriptura is writings authority over traditions and does not imply Biblical inerrancy (see above in regards to Jesus, and genealogy to David).

The New Testament was established as part of creating a universal (catholic) interpretation for all Christians.

However, if one is using the Bible as a premise and traditions, how does one evaluate discrepancies between the two, as traditions are interpretations of Bible passages as their claim for validation.

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If you study, you will find passages in the Orthodox Bible, not in the Catholic.