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Kollel Iyun Hadaf, Jerusalem
(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?2)
(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?3)
(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.4)
(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.
(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?6)
(a) According to Rav Huna Brei de'Rav Yehoshua, the above speaks about a Mavuy that is at least eight Amos wide.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 ...