Gemara Clarity

Eruvin 90a

עירובין צ׳ ע״א

Learn Eruvin 90a step by step: Aramaic beside English, every question, answer and proof colour-coded.

Open Eruvin 90a in Gemara Clarity

Topic

Carrying on roofs on שבת: combining a roof with an אכסדרה or a ruin, and the dispute of רב and שמואל about a single roof and a ship

Overview

This amud begins with the end of an answer from the previous amud: a certain structure was built to guard a garden, not to reach the roofs. רמי בר חמא then asks about carrying two אמות on a roof and two אמות on a pillar. רבה objects that this is obvious, since a roof is a כרמלית and the pillar is a רשות היחיד. So the גמרא explains that the real question was about a roof and an אכסדרה, which is not fit to live in. רב ביבי בר אביי asks a similar question about a roof and a ruin. He explains that a ruin, unlike an אכסדרה, is fit to live in, even though no one lives there now. That question ends with תיקו, unresolved. Next, רב and שמואל disagree about carrying on a single roof: רב allows the whole roof, and שמואל allows only four אמות. The גמרא settles each one's apparent self-contradiction, using noticeable walls for רב and the size of the roof (more than two בית סאה, like a קרפף not enclosed for living) for שמואל. Finally, the same two argue about carrying on a ship, and the explanation of רב's view continues on the next amud.

Opening lines

לְנַטּוֹרֵי תַּרְבִּיצָא

to guard the garden

הוּא דַּעֲבִידָא.

is what it was made for.

בְּעַי רָמֵי בַּר חָמָא:

Rami bar Chama asked:

שְׁתֵּי אַמּוֹת בְּגַג

two cubits on a roof

The steps (18)

  1. ResolutionThe structure was built to guard the garden
  2. QuestionTwo אמות on a roof and two on a pillar
  3. Challengeרבה says the answer is obvious
  4. ResolutionThe real question: a roof and an אכסדרה
  5. QuestionThe two sides of the question
  6. QuestionCarrying between a roof and a ruin
  7. ChallengeIsn't this the same as רמי בר חמא's question?
  8. ResolutionA ruin is fit to live in, unlike an אכסדרה
  9. ChallengeIf it is fit to live in, what is the question?
  10. ResolutionThe question is asked in an 'if you say' style
  11. ConclusionThe question remains unresolved
  12. Statementרב and שמואל disagree about carrying on level roofs or a single roof
  13. Challengeרב seems to contradict himself
  14. ResolutionInner walls are not noticeable, outer walls are
  15. Challengeשמואל seems to contradict himself
  16. ResolutionSize matters: a big roof is like an unlived-in enclosure
  17. StatementThe same dispute about a ship
  18. StatementStarting to explain רב's view on the ship