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The Torah was Never Tampered With! The Apikorsus Rav Moshe Feinstein Identified in the Forged Manuscript Attributed to Rav Yehuda Hachasid
The Piskei Tosfot says Ezra didn't change anything in the Torah but merely added dots in certain places. Avot D'Rebbi Natan seems to imply that Ezra wrote certain words with dots on top in case Moshe or Eliyahu question what he wrote.
Shiur provided courtesy of Torah Anytime