Shabbat 35A

תרי תילתי מיל. מאי בינייהו? איכא בינייהו פלגא דדנקא.

it means 2/3rds of a mil. The Talmud explains: What is the practical difference between them? The practical difference between them is half of 1/6th [danka], i.e., 1/12th of a mil. Their disputes are consistent, as the duration of twilight according to Rav Yosef is shorter than its duration according to Rabba.

וחילופה בחלתא. דאמר רבה: חלתא בת תרי כורי ⁠— שרי לטלטולה, ובת תלתא כורי ⁠— אסיר לטלטולה. ורב יוסף אמר: בת תלתא כורי ⁠— נמי שרי, בת ארבעה כורי ⁠— אסיר.

The Talmud comments: And with regard to the legal status of a wicker vessel their dispute is the opposite. In that case, the size of the vessel permitted by Rav Yosef is larger than the size of the vessel permitted by Rabba. As Rabba said with regard to a wicker vessel with a capacity of two kor, one is permitted to move it on Shabbat. And one with a capacity of 3 kor, one is prohibited to move it on Shabbat. It is much larger than the dimensions of a vessel and one is only permitted to move vessels on Shabbat. And Rav Yosef said: A vessel with a capacity of 3 kor, one is also permitted to move it, and only one with a capacity of 4 kor, it is prohibited to move.

אמר אביי: בעי מיניה דמר בשעת מעשה, ואפילו בת תרי כורי לא שרא לי. כמאן ⁠— כהאי תנא דתנן: כוורת הקש וכוורת הקנים ובור ספינה אלכסנדרית, אף על פי שיש להם שולים והן מחזיקות ארבעים סאה בלח שהן כוריים ביבש ⁠— טהורים. אמר אביי: שמע מינה האי גודשא תילתא הוי.

Abaye said: I raised the dilemma before my Master, Rabba, when it was practical, when I actually needed to know what to do, and he did not permit me to move even a vessel with a capacity of two kor. The Talmud explains: In accordance with whose opinion did Rabba issue his practical halakhic ruling? In accordance with the opinion of this tanna that we learned in the Mishnah discussing the laws of ritual purity: A round straw jug, and a round jug made of reeds, and the cistern of an Alexandrian ship, which is a large vessel placed on a boat and filled with potable water, although these vessels have bottoms, i.e., they are receptacles, since they have a capacity of 40 se’a of liquid, which is the equivalent of two kor of dry goods, they are ritually pure. Even if they come into contact with a source of ritual impurity, they do not become impure. Beyond a certain size, containers are no longer considered vessels and, consequently, cannot become ritually impure. Rabba held: Since with regard to the halakhot of ritual impurity a vessel of two kor is not considered a vessel, it may not be moved on Shabbat. With regard to this Mishnah, Abaye said: Learn from it that the surplus of dry goods in a vessel relative to liquids is 1/3rd of the contents of the vessel. It says in the Mishnah that a vessel that can hold 40 se’a of liquid holds two kor of dry produce, which is the equivalent of 60 se’a.