(Mishnah - R. Meir): We may sell a Beis ha'Keneses only on condition that when they want, they will [buy it back and] return it [to be a Beis ha'Keneses];

Chachamim say, it may be sold permanently, except for 4 things, i.e. to be a bathhouse, tannery, Mikveh, or Beis ha'Mayim (laundry, or a place to urinate).

R. Yehudah says, we sell it to be a courtyard. The buyer then does like he wants.

Further, R. Yehudah said that in a destroyed Beis ha'Keneses we may not eulogize, twine ropes, set traps, spread Peros on the roof to dry, or make it a shortcut;

Source: "I will make desolate your holy places" - their Kedushah is even when they are desolate.

If weeds grow in it, we do not cut them, to cause grief (that it is desolate).

(Gemara) Limitation: This refers to an individual's Beis ha'Keneses (we forbid only disgraceful uses), but a Beis ha'Keneses of Rabim, even [uses] of beauty are forbidden (Chidushei R. Meir Simchah, Bavli Megilah 30a).

(R. Chiya bar Ba): R. Yochanan cursed women who spread their garments [to dry] over the airspace of the Beis Midrash (Korban ha"Edah; R. Meir Simchah - he was lenient to let them spread garments, for it is a use of beauty. R. Yochanan holds that a Beis Midrash is less Kadosh than a Beis ha'Keneses (Bavli Megilah 27a). Perhaps he holds that a Beis Midrash of Rabim is no greater than a Yachid's Beis ha'Keneses - PF.)

(Shmuel): If one entered without intent to make it a shortcut, he may make it a shortcut.

(Beraisa): Batei Kenesiyos and Batei Midrash, we do not act frivolously in them. We do not eat or drink in them, or stroll in them, or sleep in them, or enter them for [shade from] the sun in summer or [shelter from] the rain in winter;

However, we learn and expound in them.

(R. Yehoshua ben Levi): Batei Kenesiyos and Batei Midrash are for Chachamim and their Talmidim. (They may use them for their needs.)

R. Chiyah and R. Yosa lodged in a Beis ha'Keneses [when they came to another city].

R. Eimi commanded teachers of children "if someone fluent in Torah comes to you, lodge him, his donkey and his Kelim [in the Beis Midrash].

R. Berachiyah went to the Beis ha'Keneses of Beis She'on. He saw a man wash his hands and feet from the pit of water [of the Beis ha'Keneses]. He told him "it is forbidden to you!"

The next day, that man saw [R. Berachiyah] wash his hands and feet from the pit. He said to him "Rebbi - to you it is permitted, and to me it is forbidden?!" He said "yes". The man asked why;

R. Berachiyah: So said R. Yehoshua ben Levi - Batei Kenesiyos and Batei Midrash are for Chachamim and their Talmidim.

Question: The open area [around a Beis ha'Keneses or Beis Midrash] - may one pass through it [for a shortcut]?

Answer: R. Avahu passed through the open area around a Beis Midrash. (This shows that it is permitted.)

Rebuttal (R. Zecharyah, the son-in-law of R. Levi): A teacher [of children] imposed excessive fear on them, and had R. Avahu not passed through, he would not have let the children leave.