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ERUVIN 101
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SUMMARY

1. The Mishnah discusses which sealants one may not use to seal a doorway.
 
2. There is a dispute about when it is permitted to use such an item to seal a doorway when the item drags on the ground.
 
3. One may not use a board that is not on a hinge to seal a breach in a wall.
 
4. Rebbi Yehoshua ben Chananyah explained to a Tzeduki the meaning of the verse, "Their good ones are like thorns."
 
5. The Mishnah discusses the law of an item used to lock a door that could also be used for crushing peppers.

A BIT MORE

1. A board (or other item, such as a large mat) that serves as a door to an entranceway but does not fit exactly, may not be used if it drags on the ground, because it appears like the Melachah of building.
 
2. Abaye: It is permitted when it is attached to a hinge. Rava: It is permitted even if it had once been attached to a hinge in this place.
 
3. This also gives the appearance of building.
 
4. This means that just as thorns protect open areas, righteous Jews protect Bnei Yisrael.
 
5. Rebbi Eliezer: It is forbidden to use it to lock the door unless it is tied to the door. Rebbi Yosi: It is permitted to use it to lock the door because it is a vessel.

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