Related for Eruvin 195:16
[אמר ליה אביי] במאי אוקימתא למתניתין בכותל משופע אימא סיפא רבי יהודה אומר אפילו אינו מסולק מן הארץ אלא מלא החוט גוללו אצלו והא נח ליה
B'Ahabah replied: This proves that holy writings may not be thrown.<span class="x" onmousemove="('comment',' Sof. III, 12.');"><sup>43</sup></span> IF HE WAS HEADING IT ON THE TOP OF A ROOF etc. But is this<span class="x" onmousemove="('comment',' To turn a holy scroll WITH ITS WRITING DOWNWARDS.');"><sup>44</sup></span> permitted.
Kitzur Shulchan Arukh
When you are studying [Torah] and you need to go out, you should not leave your book open, because this causes you to forget what you learned. (Sifsei Kohein Yoreh Deiah 277)
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