Related for Eruvin 195:13
היה קורא בראש הגג וכו': ומי שרי והתניא כותבי ספרים תפילין ומזוזות לא התירו להן להפך יריעה על פניה אלא פורס עליה את הבגד
while in the public domain and then carry them<span class="x" onmousemove="('comment',' Even where the entire scroll had dropped into the public domain.');"><sup>34</sup></span> directly into the private domain?<span class="x" onmousemove="('comment',' Thus infringing a Pentateuchal prohibition.');"><sup>35</sup></span> - The author of this ruling is<span class="x" onmousemove="('comment',' Lit., 'whose (ruling) is this?'');"><sup>36</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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