(Mishnah - Beis Shamai): Hechsher (what is necessary to permit carrying in a) Mavoy is a Lechi and a Korah;

Beis Hillel say, it is a Lechi or a Korah.

R. Eliezer says, it is Lechiyim (one Lechi on each side).

A Talmid citing R. Yishmael said in front of R. Akiva that Beis Shamai and Beis Hillel agree that a Lechi or Korah permits a Mavoy [if the width of the opening is] less than four Amos. Beis Shamai require a Lechi and Korah only if it is between four and 10 Amos;

R. Akiva: They argue in both cases (more or less than four Amos).

(Gemara) Questions: What is Lechiyim [that R. Eliezer says]? Is it [two] Lechiyim and a Korah, like Beis Shamai, or Lechiyim without a Korah, like Beis Hillel? [Is each Lechi] three Tefachim, like R. Yosi, or Kolshehu, like Rabanan?

Answer: We learn from the following. A case occurred in which R. Eliezer went to R. Yosi ben Yosi ben Parurah his Talmid, to Uvlin, and showed him a Mavuy, and it had only one Lechi. [R. Eliezer] said to him "make Lechiyim for it'';

[R. Yosi] said back "you tell me to seal it?!'' He said to him "close it - [if there is only one], what proof do you bring to show that it was erected to permit carrying on] Shabbos through this?''

Inference: [Each Lechi is] three, like R. Yosi. If it were Kolshehu, like Rabanan, does Kolshehu seal?!

(Beraisa): The Halachah follows that Talmid.

Question: Why do we say so - [for it affects the law] according to Beis Shamai? Does the Halachah follow Beis Shamai, and not Beis Hillel?!

Answer: Rather, it is because R. Shimon ben Gamliel says that a Mavuy less than four Tefachim does not need a Korah according to Chachamim;

(Rav Huna citing Rav): A Mavuy less than four Amos does not need anything. (The Beraisa teaches that Beis Hillel require a Lechi or Korah even for a small Mavuy, unlike R. Shimon ben Gamliel.)