(Associated Press) For the past 30 years, Israeli Judaic scholar Menachem Cohen has been on a mission of biblical proportions: Correcting all known textual errors in Jewish scripture to produce a truly definitive edition of the Old Testament.

Though his edits won’t mean much to the average reader – they focus primarily on grammatical blemishes and an intricate set of biblical symbols – it marks the first major overhaul of the Hebrew Bible in nearly 500 years.

Poring over thousands of medieval manuscripts, the 84-year-old Cohen identified 1,500 inaccuracies in the Hebrew language texts that have been corrected in his completed 21-volume set. The final chapter is set to be published next year.

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