Related for Eruvin 195:2
רישא וסיפא רבי שמעון מציעתא רבי יהודה אמר רב יהודה אין רישא וסיפא ר"ש מציעתא רבי יהודה
R'SIMEON RULED: EVEN IF IT TOUCHED THE ACTUAL. GROUND, HE MAY ROLL IT BACK TO HIMSELF. Is it likely that the first and final clauses represent the view of R'Simeon while the middle one represents that of R'Judah? -Rab Rabbah replied: Yes the first and final clauses may represent the view of R'Simeon while the middle one represents that of R'Judah: Rabbah replied: We deal here with a threshold that was trodden upon [by the public] and in order [to avert] disrespect to the holy writings<span class="x" onmousemove="('comment',' By leaving it in a place where it might be trodden upon.');"><sup>3</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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