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prepared by Rabbi Eliezer Chrysler
Kollel Iyun Hadaf, Jerusalem

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Eruvin 5


(a) If the Koreh is less than ten Tefachim high, our Mishnah prescribes digging a trench across the width of the Mavoy. According to Rav Yosef, the trench must extend at least four Tefachim into the Mavoy. What does Abaye say to this?

(b) Why are both Rav Yosef and Abaye more stringent with regard to *extending* its height than to *reducing* it)? What is the basic difference between the two cases?

(a) If one of the side walls of a Mavoy breaks, leaving a gap in the wall, Rebbi Ami and Rebbi Asi rule that a gap of up to ten Amos does not invalidate the Mavoy - provided that even a makeshift wall (consisting of a plank) of four *Tefachim* remains still standing at the corner, adjacent to the Koreh that is Matir the Mavoy. Is it correct to say that Abaye (who requires four *Amos* in the above case) does not hold like Rebbi Ami and Rebbi Asi?

(b) What size breach will invalidate the Mavoy, according to Rebbi Ami and Rebbi Asi, if less than four Tefachim remain at the corner?

(c) Why would the Mavoy be Pasul in this latter case?

(a) Abaye proves that a Mavoy which is less than four Tefachim, cannot be Kasher, from a Beraisa, which describes a Mavoy as having at least two Chatzeros opening into it.
What is the minimum number of houses that each Chatzer must consist of, and where must they be situated?

(b) What is a Chatzer called if the houses are at the back?

(c) Why can the Beraisa not be speaking (even by a Mavoy of four Tefachim) when the Chatzer opened into the far end of the Mavoy?

(d) How does Rav Yosef explain this Beraisa?

(a) Abaye brings another proof from a statement in the name of Rav Huna, who validates a vertical board that protrudes (from a house) across part of the entrance of the Mavoy (even though it was not placed there deliberately as a Lechi), provided it is less than four Amos.
What is Abaye's proof from there?

(b) How does Rav Yosef (in whose opinion, a Mavoy that is four Tefachim long is Kasher) refute this proof?

Answers to questions



(a) How can Rav Huna say that, if the board that extends from the wall of the Mavoy across the entrace of the Mavoy is four Amos long, it requires another Lechi to permit the Mavoy? Is this not simply a matter of extending the Pasul Lechi? Rav Huna Brei de'Rav Yehoshua gets round this by saying 'de'Metafi Bei O de'Mevatzer Bei. What are the two possible meanings of this statement?

(b) What does Rav Papa hold in this case?

(a) According to Rav Huna Brei de'Rav Yehoshua, the above speaks about a Mavuy that is at least eight Amos wide.
What will be the Din by a Mavoy that is *less* than that?

(b) How does he learn this with a Kal va'Chomer from the Din of a Chatzer?

(c) What similar Kal va'Chomer might we have made from a Chatzer by a Lechi of four Tefachim in the entrance of a Mavoy which is more than eight Amos?

(d) On what grounds do we not, in fact, make such a Kal va'Chomer?

7) But a Chatzer has a leniency over a Mavoy: namely, that a breach in the wall of a Chatzer only invalidates the Din of Chatzer if it is at least *ten* Amos, whereas a similar breach in the wall of a Mavoy invalidates the Mavoy, even if it is only *four* Amos (according to Rav Huna - four *Tefachim*) long. In that case, how can Rav Huna Brei de'Rav Yehoshua learn a Kal va'Chomer from Chatzer to be lenient by Mavoy?

8) Why does Rav Ashi consider the Mavoy Kasher even with an entrance that is eight Amos ...

  1. ... when the standing wall is longer than the breach?
  2. ... when the breach is longer than the standing wall?
  3. ... when they are exactly the same size?
Answers to questions
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