Eruvin 83B

כדי עיסותיכם, וכמה עיסותיכם? כדי עיסת המדבר. וכמה עיסת המדבר?

What is the quantity of dough from which ḥalla must be separated? The amount of “your dough.” And how much is “your dough”? This amount is left unspecified by the verse. The Talmud answers: It is as the amount of the dough of the wilderness. The Talmud again asks: And how much is the dough of the wilderness?

דכתיב: ״והעומר עשירית האיפה הוא״. מכאן אמרו, שבעה רבעים קמח ועוד חייבת בחלה, שהן ששה של ירושלמית, שהן חמשה של ציפורי.

The Talmud responds: The Torah states that the manna, the dough of the wilderness, was “an omer a head” (Exodus 16:16). A later verse elaborates on that measure, as it is written: “And an omer is the tenth part of an eifa” (Exodus 16:36). An eifa is 3 se’a, which are 18 kav or 72 log. An omer is 1/10th of this measure. From here, this calculation, rabbis said that dough prepared from 7 quarters of a kav of flour and more is obligated in ḥalla. This is equal to 6 quarter-kav of the Jerusalem measure, which is 5 quarter-kav of the Tzippori measure.

מכאן אמרו: האוכל כמדה זו ⁠— הרי זה בריא ומבורך. יתר על כן ⁠— רעבתן. פחות מכאן ⁠— מקולקל במעיו.

From here the rabbis also said: One who eats roughly this amount each day, is healthy, as he is able to eat a proper meal; and he is also blessed, as he is not a glutton who requires more. One who eats more than this is a glutton, while one who eats less than this has damaged bowels and must see to his health.

מתני׳ אנשי חצר ואנשי מרפסת ששכחו ולא עירבו, כל שגבוה עשרה טפחים ⁠— למרפסת. פחות מכאן ⁠— לחצר.

Mishnah: If both the residents of houses that open directly into a courtyard and the residents of apartments that open onto a balcony from which stairs lead down to that courtyard forgot and did not establish an eiruv between them, anything in the courtyard that is 10 handbreadths high, e.g., a mound or a post, is part of the balcony. The residents of the apartments open to the balcony may transfer objects to and from their apartments onto the mound or post. Any post or mound that is lower than this height is part of the courtyard.