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Case file

Brethren of Purity

Wikipedia's first sentence called it “secret society of muslim philosophers in basra”. Today it says “secret society active during the reign of the buyid dynasty”.
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.
We saved snapshots of this article over twenty years; you are reading the 2025 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2025

Medieval secret society of Muslim philosophers This article is about a group of Iraqi polymaths. Double-leaf frontispiece from the " Encyclopedia of the Brethren of Purity ", Süleymaniye Library , Baghdad , 1287. The Brethren of Purity ( Arabic : إخوان‌ الصفا , romanized : Ikhwān Al-Ṣafā ; also The Brethren of Sincerity ) were a secret society of Muslim philosophers in Basra , Iraq , in the 9th or 10th century CE. The structure of the organization and the identities of its members have never been clear. Their esoteric teachings and philosophy are expounded in an epistolary style in the Encyclopedia of the Brethren of Purity ( Rasā'il Ikhwān al-Ṣafā' ), a giant compendium of 52 epistles that would greatly influence later encyclopedias. A good deal of Muslim and Western scholarship has been spent on just pinning down the identities of the Brethren and the century in which they were active. They are generally considered a secret society because of their closed and private meetings every 12 days, as mentioned in the Rasa'il . (1960), "On the Ethics of the Brethren of Purity", The Muslim World , 50: 109–121. نور, مكتبة.

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 1280422496.
Today
Wikipedia's first sentence called it “secret society of muslim philosophers in basra”. Today it says “secret society active during the reign of the buyid dynasty”. Read the current article and compare.
201020152020Oct '232025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.

What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since 2010, and today's defining sentence is their current revision.

Then

secret society of muslim philosophers in basra

Now

secret society active during the reign of the buyid dynasty

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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