Eruchin 9:5 - 9:6

כל שלפנים מן החומה – such as the building containing the tank and all the implements for pressing olives that they make olive oil in them and the bathhouses and towers and cisterns, ditches and caves. As it is written (Leviticus 25:30): “in the city [that has a wall],” including everything that is within the city. I would be able to include the fields, the inference teaches us, “the house [in the walled city shall pass to the purchaser beyond reclaim throughout the ages],” (ibid.) excluding the fields that are not similar at all to the houses.

ר' מאיר אומר אף השדות – Rabbi Meir is stating not the actual fields, for it is written “the house” (Leviticus 25:30), and fields are not similar to houses. But the land of rocks and fish-ponds/glen (see Tractate Arakhin 32a) that are not appropriate for sowing and are made for the building of the house. A place of stones, to take from there stones for building. And a fish-pond/glen – to take from there sand for building. But the Halakha is not according to Rabbi Meir.

אינו כבתי ערי חומה – to be permanently sold at the end of a year.

כותל החיצון הוא חומתו – and it is judged like houses in a walled city. And the Halakha is according to Rabbi Yehuda.

שגגותיה חומותיה – that a wall did not surround it but rather houses surround and the immediate sequence of houses one next to the other are like a wall.

אינה כבתי ערי חומה – for [the word] "חומה" /wall (see Leviticus 25:29: “if a man sells a dwelling house in a walled city”)is written and not that its roofs are its walls.

ושאינה מוקפת חומה מימות יהושע בן נון – but that which is surrounded by a wall from the days of Joshua son of Nun even though it does not have a wall now, is judged like a dwelling house in a walled city. It is written as (Leviticus 27:30): " [הבית אשר-בעיר אשר-] לוא חומה" /the house in the walled city, with a full [letters] Vav and Alephs, that implies that it is his and implies not [his], meaning to say, it does not have it now, but it had a wall prior to this, therefore, it is also house that is permanently sold.

שלש חצרות – that in each and every one [of the courtyards] is two houses, which is called a city.

כגון קצרה – the name of a small city that was outside of Tsippori.

וחקרא שבגוש חלב וכו' – all of these that are counted in our Mishnah, are known that they been walled [cities] from the time of Joshua son of Nun. But Jerusalem that is counted in our Mishnah, we hold that there is no permanently sold house in Jerusalem, therefore there is the opinion of one [Sage (Rav Ashi)] in the Gemara (Tractate Arakhin 32b), and this is not the holy Jerusalem where a house cannot be sold permanently, but there is another Jerusalem that was in the Land of Israel and it also was surrounded by a wall from the time of Joshua, and there was a house sold permanently in it like the rest of dwelling houses in a walled city.