Commentary for Eruvin 55:12

לא קשיא הא מקמי דאתא רב לבבל הא לבתר דאתא רב לבבל

But is it not [permitted to prepare an 'erub] from lichen? Has not Rab Judah in fact stated in the name of Rab: An 'erub may be prepared from cuscuta or lichen and the benediction of '[Blessed art Thou.] Who createth the fruit of the ground' is to be Pronounced over them? _ This is no difficulty. The one ruling was made<span class="x" onmousemove="('comment',' Lit., 'that', that lichen may not be used in an 'erub.');">³⁷</span>

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