Related for Eruvin 195:9
הכא במאי עסקינן באיסקופה ארוכה אדהכי והכי מידכר
intervened this<span class="x" onmousemove="('comment',' The possibility of carrying across It from the one domain into the other.');"><sup>22</sup></span> need not be provided against,<span class="x" onmousemove="('comment',' Lit., 'we have nothing against It');"><sup>23</sup></span> did not Raba, [it may be objected,] state:<span class="x" onmousemove="('comment',' Shah. 8b.');"><sup>24</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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