Related for Eruvin 195:8
אי הכי תוך ד' אמות נמי נגזר דילמא מעייל מרה"ר לרה"י וכי תימא כיון דמפסקת כרמלית לית לן בה והאמר רבא המעביר חפץ מתחלת ארבע לסוף ארבע והעבירו דרך עליו חייב
why should not a preventive measure be enacted, even [where the end of the scroll rested] within the four cubits, lest one night come to carry [the scroll]<span class="x" onmousemove="('comment',' I.e., where both ends dropped from the hands of the reader into the public domain.');"><sup>19</sup></span> from the public into a private domain?<span class="x" onmousemove="('comment',' Sc. into the house behind the threshold.');"><sup>20</sup></span> And should you reply: Since a karmelith<span class="x" onmousemove="('comment',' The threshold.');"><sup>21</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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