Halakhah for Eruvin 10:2
אותו לחי היכן מעמידו אי דמוקי ליה בהדי' אוספי הוא דקא מוסיף עליה
If it be attached to the projection,<span class="x" onmousemove="('comment',' Lit., 'put up with it'.');"><sup>4</sup></span> would not one be merely adding to it?<span class="x" onmousemove="('comment',' Thus merely extending the projection further along the width of the alley and giving it a much greater resemblance to a proper wall.');"><sup>5</sup></span> - R'Papa replied: One puts it upon the other side.<span class="x" onmousemove="('comment',' The side wall opposite.');"><sup>6</sup></span> R'Huna son of R'Joshua said: It may even be maintained that it<span class="x" onmousemove="('comment',' The side-post.');"><sup>7</sup></span>
Shev Shmat'ta
We hold that a safek isur Torah is asur, and the opinion of the Rambam in his great work [Mishneh Torah] in several places, is that this rule is only mid'rabanan, and that mid'oraisa all case of doubt are mutar. This is also the opinion of the Raavad. But the Ramban and the Rashba argue and they prove that when Chazal say "you must be stringent on a doubt of Torah prohibiton", that is mid'oraisa. And the Pri Chadash in Yoreh Deah elaborates on this. See there, section 110.
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