Reference for Eruvin 30:22

ת"ש שיירא שחנתה בבקעה והקיפוה בגמלין באוכפות

Come and hear: If a man covered the roof<span class="x" onmousemove="('comment',' Or 'laid the roof-beams'.');">⁴⁷</span> of his sukkah<span class="x" onmousemove="('comment',' v. Glos.');">⁴⁸</span> with spits or with the long [sides] of a bed<span class="x" onmousemove="('comment',' Such objects, since they are proper 'instruments', are susceptible to levitical uncleanness and consequently unfit for the roof covering of a sukkah.');">⁴⁹</span> [the sukkah is] valid if there is as much space between them as that of their own [width]!<span class="x" onmousemove="('comment',' Suk. 15a; because the intervening spaces can be filled up with suitable and ritually fit roofing. This Mishnah then seems to show that where the measurement of the suitable and the unsuitable parts are equal, the structure is valid; and, since the same principle would obviously apply also to the validity of an enclosure, in respect of the Sabbath laws, where its built-up parts equal its gaps, does not an objection arise against R. Huna?');">⁵⁰</span> Here we are dealing [with such] as can be easily moved in and out.<span class="x" onmousemove="('comment',' Lit., 'when it (freely) enters and goes out', sc. between the parts to be covered with the suitable roofing, so that the width of each spit or bed-side is inevitably less than that of each properly covered intervening space. xhrd har');">⁵¹</span> Is it, however, possible<span class="x" onmousemove="('comment',' So R. Han. Cur. edd., 'surely it is possible', is a different reading (as pointed out by Tosaf. s.v. a.l.) .');">⁵²</span> to be exact?<span class="x" onmousemove="('comment',' Sc. is it possible that by supplying a quantity of suitable material equal in width to that of the unsuitable one, the air spaces intervening between the two materials will be duly covered? The answer obviously being in the negative, the question arises: How, in view of the fact that the space of the proper material does not even equal that of the improper one plus the intervening air spaces, could the sukkah be valid? This raises an objection against R. Huna but also against R. Papa (cf. Tosaf. l.c.) .');">⁵³</span> - R'Ammi replied: One might supply more [of the proper roofing].<span class="x" onmousemove="('comment',' And thus cover up the intervening air spaces also.');">⁵⁴</span> Raba replied: If they<span class="x" onmousemove="('comment',' The spits etc.');">⁵⁵</span> were placed crosswise, one puts the suitable material lengthwise, [and if they were placed] lengthwise, one puts it crosswise.<span class="x" onmousemove="('comment',' So that all the spaces between the improper material are fully covered with the proper one which, according to R. Papa, thus covers as much space as the improper one; and according to R. Huna, since the spits etc. can be easily moved in and out, the proper roofing covers the larger area.');">⁵⁶</span> Come and hear: If a caravan camped in a valley and it was surrounded by camels, saddles,

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