Related for Eruvin 195:4
איתיביה אביי תוך ד' אמות גוללו אצלו חוץ לד' הופכו על הכתב ואי אמרת באיסקופה נדרסת עסקינן מה לי תוך ד' אמות מה לי חוץ לארבע אמות
[If it rested] within four cubits<span class="x" onmousemove="('comment',' On the ground.');"><sup>8</sup></span> one may roll it back to oneself, [but if it rested] without the four cubits one must turn it over with its writing downwards. Now if you maintain that we are dealing with a threshold that was trodden upon by the public<span class="x" onmousemove="('comment',' And that, in order to protect the sacred scroll from abuse, a shebuth was dispensed with.');"><sup>9</sup></span>
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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