If tish'a b'av were to fall on shabbos, would the sections of Torah prohibited for study on tish'a b'av cause the seforim in which they are found to be muktze? If in a given sefer there are prohibited sections together with permitted sections of study (e.g. a nach) then I assume the permitted material would not make the entire sefer muktze since one can read it on tish'a b'av. Also, if such seforim are muktze, which category or categories of muktze would they be and why?

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    Not everyone prohibits any Torah study on that Shabbat – Double AA Jul 30 '17 at 10:49
  • How is this different from books that can't be read in any other Shabbat (eg. business books probably).? – Double AA Jul 30 '17 at 10:50
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    reading or consulting a book is permitted, – kouty Jul 30 '17 at 13:17
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    Related: judaism.stackexchange.com/questions/76862/… – SAH Jul 31 '17 at 6:03

When shabos came in it was not muktze because it was permitted to use it. Then it can't become muktze unless it changed to a different shape.

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  • Welcome to Mi Yodeya Yosel! Adding in sources would greatly improve this post. – mevaqesh Jul 31 '17 at 17:24
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    Why would it be permissible to use when Shabbat comes in? Isnt it already the 9th of Av? – mevaqesh Jul 31 '17 at 17:24
  • What @mevaqesh said. Also, I thought that stuff doesn't "become [fully] muktzeh" Shabbos until nightfall – SAH Sep 12 '17 at 4:48

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