Related for Eruvin 195:3
רבה אמר הכא באיסקופה הנדרסת עסקינן ומשום בזיון כתבי הקדש שרו רבנן
the Rabbis<span class="x" onmousemove="('comment',' Even R. Judah.');"><sup>4</sup></span> have permitted [to roll it back].<span class="x" onmousemove="('comment',' Since only a shebuth is thereby affected. The threshold, however, cannot be compared to a roof where a preventive measure could well be enacted since in that case the scroll is not exposed to so much abuse.');"><sup>5</sup></span> Abaye raised an objection against him:<span class="x" onmousemove="('comment',' Rabbah.');"><sup>6</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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