They may not sell a synagogue except under the condition that, if they wish, they may repurchase it —- this is the opinion of R’ Meir. The Sages say, however, they may sell it permanently [and for any purpose] except for [the following] four uses: as a bathhouse, a tannery, a mikveh, or a water closet. R’ Yehudah says: They may sell it as a courtyard and the purchaser may do as he pleases.