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Case file

Aaron ben Moses ben Asher

Wikipedia's first sentence called it “first to take hebrew grammar seriously”. Today it says “sofer”. Sections present on October 6, 2023 no longer exist: “Questions about possible Karaite ancestry”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
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The opening as it read in 2005

Aaron ben Moses ben Asher ( 10th century ) developed the Tiberian system for writing down vowel sounds in Hebrew . Since his day, both handwritten manuscripts of the Tanakh and printed versions strove to emulate his achievement and continue to do so. He was descended from a long line of Masoretes , starting with someone called Asher, but nothing is known about them other than their names. His father, Moses ben Asher, is credited with writing the Cairo Codex of the Prophets (895CE); if authentic, it is among the oldest manuscripts containing a large proportion of the Hebrew Bible. Aaron ben Asher himself added vowelization and cantillation notes, and mesorah to the Aleppo Codex , correcting its letter-text according to the masorah. Maimonides , by accepting the views of Ben-Asher (though only in regard to open and closed sections), helped establish and spread his authority. Referring to a Bible manuscript then in Egypt, he wrote: "All relied on it, since it was corrected by Ben-Asher and was worked on and analyzed by him for many years, and was proofread many times in accordance with the masorah, and I based myself on this manuscript in the Sefer Torah that I wrote". More recently, Umberto Cassuto used this manuscript as the basis of his edition of the Hebrew Bible. Aaron ben Moses ben Asher was the first to take Hebrew grammar seriously. He was the first systematic Hebrew grammarian. His Sefer Dikdukei ha-Te'amim (Grammar of the Vocalizations) was an original collection of grammatical rules and masoretic information. Grammatical principles were not at that time considered worthy of independent study. The value of this work is that the grammatical rules presented by Ben-Asher reveal the linguistic background of vocalization for the first time. He had a tremendous influence on the world of Biblical grammar and scholarship.1

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 16449717.
Today
Wikipedia's first sentence called it “first to take hebrew grammar seriously”. Today it says “sofer”. Sections present on October 6, 2023 no longer exist: “Questions about possible Karaite ancestry”. Read the current article and compare.
2005201020152020Oct '232025
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What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since 2005, and today's defining sentence is their current revision.

Then

first to take hebrew grammar seriously

Now

sofer

Sections that no longer exist

Present on October 6, 2023, absent today, with no near-matching heading in the current article and the article shorter overall, so this is not a renamed heading or a topic absorbed into a fuller treatment. 1 section of 400 characters or more gone since October 6 2023, with the article 18 characters shorter.

  • Questions about possible Karaite ancestry
Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

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