Musar for Shabbat 274:12
<big><strong>גמ׳</strong></big> השתא ר"א אוסופי אהל עראי לא מוספינן למיעבד לכתחלה שרי
What is this allusion? For we learnt: As for the stopper of a skylight, — R. Eliezer said: When it is fastened and suspended, one may close [the skylight] with it; if not, one may not close [the skylight] with it. But the Sages maintain: In both cases you may close [the skylight] with it. Whereon Rabbah b. Bar Hanah said in R. Johanan's name: All agree that a temporary tent may not be made on Festivals, whilst on the Sabbath it goes without saying. They differ only in respect of adding [to a tent]; R. Eliezer maintaining. One may not add on a Festival, whilst on the Sabbath it goes without saying; whereas the Sages rule: One may add on the Sabbath, whilst it is superfluous to speak of Festivals!<span class="x" onmousemove="('comment',' This means that R. Eliezer forbids even adding to a temporary tent. ');"><sup>9</sup></span>
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