Related for Eruvin 195:11
הא מני בן עזאי היא דאמר מהלך כעומד דמי ודילמא זריק להו מזרק דאמר רבי יוחנן מודה בן עזאי בזורק
- Here we are dealing with all extensive<span class="x" onmousemove="('comment',' Lit., 'log'.');"><sup>28</sup></span> threshold<span class="x" onmousemove="('comment',' The crossing of which, on one's way from the public into the private domain, would take some time.');"><sup>29</sup></span> in crossing which<span class="x" onmousemove="('comment',' Lit., 'in the meanwhile'.');"><sup>30</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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