I know that the chapter divisions are a Christian invention, and therefore don't exist in very old Jewish sources (Aleppo Codex, Leningrad Codex, dead sea scrolls, etc.). However our divisions don't always agree with the Christian divisions. What are the Jewish sources for these divisions? If we rely for example on various codexes for our text and vowels, what do we rely on to know where to insert chapter breaks?

Just for the record, I have noticed that different printed chumashim differ. For example the chapter breaks in my Koren tanach do not match my Artscholl or Hertz chumash. (This last fact is what has led me to try and find out the answer to this).

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    Are you asking about Petuchot/Setumot?
    – Double AA
    Commented Nov 14, 2014 at 5:05
  • @DoubleAA No, the chapter divisions in modern chumashim and tanachim. For example when we say "Vayikra 3:5", we know that's Vayikra chapter 3. Commented Nov 14, 2014 at 6:00
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    Bachrach44 (and cc @DoubleAA) I've seen only one edition of Tanach with numbered sections (not the Christian ones). It listed the Christian chapter numbers along one margin and these other things along the opposing margin. IIRC it's by Koren. It's not the parashiyos s'sumos and p'suchos.
    – msh210
    Commented Nov 14, 2014 at 9:48
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    It would be useful to add some examples of differences. Here's one: The Christian convention for where Jeremiah 31 starts, which, for some reason, is the one in place at Sefaria, is one verse earlier than the convention applied in most Jewish versions, such as the one at Mechon Mamre.
    – Isaac Moses
    Commented Jul 7, 2015 at 14:25
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    I think there's a difference in most of the psalms, too, having to do with how the introductory phrase is treated -- resulting in an off-by-one difference for the rest of the chapter. Commented Jul 7, 2015 at 15:09


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