Halakhah for Eruvin 10:8
רב הונא בריה דרב יהושע טעמא דנפשיה קאמר
[across its entrance] is larger than its open [part]. But is no courtyard, however, different<span class="x" onmousemove="('comment',' Lit., 'what of the courtyard'.');"><sup>22</sup></span> [from an alley]<span class="x" onmousemove="('comment',' Sc. some of the laws relating to the former are much less restrictive than those of the latter.');"><sup>23</sup></span> since a gap of ten cubits<span class="x" onmousemove="('comment',' Lit., 'its breach by ten'.');"><sup>24</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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