Commentary for Eruvin 76:20

כמאן כרבי יוחנן בן נורי דאמר חפצי הפקר קונין שביתה

Now then,<span class="x" onmousemove="('comment',' If, as just stated, an 'erub takes effect at the beginning, sc. at twilight of the eve of the day for which it is prepared.');">²⁹</span> why should not people be allowed to prepare an 'erub with a 'lagin'?<span class="x" onmousemove="('comment',' 'That was a tebul yom' (supra 36a) . The reason for the invalidity of the 'erub given there was that before the Sabbath begins it consisted of tebel. But if an 'erub does not take effect (cf. previous note) before the Sabbath actually begins the 'erub in the lagin, since the moment Sabbath begins it is no longer tebel, should be valid.');">³⁰</span>

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