Halakhah for Shabbat 67:9
מה נפשך אי בין השמשות יממא הוא בתרא ליקני קמא לא ליקני ואי בין השמשות ליליא הוא קמא ליקני בתרא לא ליקני בין השמשות ספקא הוא וספקא דרבנן לקולא:
MAY BE TITHED,<span class="x" onmousemove="('comment',' Because the probability is that tithes have already been rendered, and thus this tithing does not really make it fit. ');"><sup>16</sup></span> AN 'ERUB MAY BE PREPARED, AND HOT FOOD MAY BE STORED AWAY.<span class="x" onmousemove="('comment',' To retain its heat. ');"><sup>17</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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