Eruvin 76a

עירובין ע״ו ע״א

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Topic

Houses between courtyards and crossing עירובין (end of הדר), then a window between two courtyards: its size, height, and the measure of a round window

Overview

This amud opens with the end of a ruling from the previous daf. Three houses sit between two courtyards: each outer house is a בית שער, and the middle house holds the עירוב. רחבה then tests the רבנן with two houses between two courtyards, where each resident passes through one house and places his עירוב in the other. The רבנן rule that neither עירוב works, because a house cannot be a בית for one person and a בית שער for the other. They also reject רחבה's comparison to רבא's twilight ruling, since a hidden doubt about time is different from a visible house. The chapter הדר ends. A new chapter opens with a משנה about a window between two courtyards: if it is four by four טפחים and within ten טפחים of the ground, the courtyards may share one עירוב. The גמרא shows that even the רבנן agree an opening must be four by four. It also learns that a window only partly within ten still counts, which matches a ברייתא. Finally רבי יוחנן gives the size of a round window, 24 טפחים around, and the גמרא asks why twelve is not enough. The answer comes on the next amud.

Opening lines

The steps (17)

1. ConclusionOuter houses are gatehouses and the middle house holds the עירוב
2. Questionרחבה's test case of two houses with crossing עירובין
3. ResponseNeither עירוב works, whichever way you look at it
4. ChallengeChallenge from רבא's ruling on twilight עירובין
5. ResolutionWhy רבא's case is different from the two-house case
6. ConclusionHadran — Closing the chapter הדר
7. StatementA large, low window lets two courtyards choose one עירוב
8. StatementA small or high window means only separate עירובין
9. QuestionDoes the unattributed משנה follow רבן שמעון בן גמליאל?
10. RejectionEven the רבנן agree an opening needs four by four
11. ChallengeWhy state the smaller or higher window case at all?
12. ResolutionA window only partly within ten still counts
13. ProofThe משנה's lesson matches a ברייתא
14. ChallengeWhy does the ברייתא list the easier case?
15. ResolutionA 'this, and certainly that' style
16. StatementHow big a round window must be
17. ChallengeWhy twenty-four? Twelve should be enough