It was taught in a baraita in tractate Derekh Eretz that Rabbi Akiva said: I once entered the bathroom after my teacher Rabbi Yehoshua, and I learned three things from observing his behavior: I learned that one should not defecate while facing east and west, but rather while facing north and south; I learned that one should not uncover himself while standing, but while sitting, in the interest of modesty; and I learned that one should not wipe with his right hand, but with his left. Ben Azzai, a student of Rabbi Akiva, said to him: You were impertinent to your teacher to that extent that you observed that much? He replied: It is Torah, and I must learn. Similarly, we learned in a baraita: Ben Azzai said: I once entered a bathroom after Rabbi Akiva, and I learned three things from observing his behavior: I learned that one should not defecate while facing east and west, but rather while facing north and south; I learned that one should not uncover himself while standing, but while sitting; and I learned that one should not wipe with his right hand, but with his left. Rabbi Yehuda said to him: You were impertinent to your teacher to that extent? He replied: It is Torah, and I must learn. On a similar note, the Gemara relates that Rav Kahana entered and lay beneath Rav’s bed. He heard Rav chatting and laughing with his wife, and seeing to his needs, i.e., having relations with her. Rav Kahana said to Rav: The mouth of Abba, Rav, is like one whom has never eaten a cooked dish, i.e., his behavior was lustful. Rav said to him: Kahana, you are here? Leave, as this is an undesirable mode of behavior. Rav Kahana said to him: It is Torah, and I must learn.
מקרי ליה רב יהודה לרב יצחק בריה (קהלת ז, כו) ומוצא אני מר ממות את האשה א"ל כגון מאן כגון אמך
The Gemara cites a related incident: Rav Yehuda was teaching Torah to Rav Yitzḥak, his son, and they encountered the verse: “And I find more bitter than death the woman” (Ecclesiastes 7:26). His son said to him: For example, whom? His father replied: For example, your mother.
אי הכי אימא סיפא חוץ מחמשים אמה הרי הוא של מוצאו ואי דליכא ודאי מההוא נפל הכא במאי עסקינן במדדה דאמר רב עוקבא בר חמא כל המדדה אין מדדה יותר מחמשים בעי ר' ירמיה רגלו אחת בתוך חמשים אמה ורגלו אחת חוץ מחמשים אמה מהו ועל דא אפקוהו לרבי ירמיה מבי מדרשא
The Gemara asks: If so, say the latter clause of the mishna: If it was found beyond fifty cubits from a dovecote, it belongs to its finder. And if there is no other dovecote in the area, it certainly fell from that dovecote. How, then, can it be given to the finder? The Gemara answers: With what are we dealing here? We are dealing with a chick that hops from place to place but does not yet fly. As Rav Ukva bar Ḥama says: With regard to any creature that hops, it does not hop more than fifty cubits. Consequently, any bird found within fifty cubits of a dovecote is assumed to have come from there. If it is farther away than that, it likely came from elsewhere or was dropped by travelers. Rabbi Yirmeya raises a dilemma: If one leg of the chick was within fifty cubits of the dovecote, and one leg was beyond fifty cubits, what is the halakha? The Gemara comments: And it was for his question about this far-fetched scenario that they removed Rabbi Yirmeya from the study hall, as he was apparently wasting the Sages’ time.
Rabbi Zeira said that Rabbi Asi said that Rabbi Elazar said that Rabbi Ḥanina said that Rav said: Alongside this specific pillar before me, Rabbi Yishmael, son of Rabbi Yosei, prayed the Shabbat prayer on the eve of Shabbat before nightfall.
But when Ulla came from the Eretz Yisrael to Babylonia, he related a different version of this story. He said that he had heard: This transpired beside a palm tree, not beside a pillar, and it was not Rabbi Yishmael, son of Rabbi Yosei, but it was Rabbi Elazar, son of Rabbi Yosei, and it was not the Shabbatprayer on Shabbat eve before nightfall, rather it was the prayer of the conclusion of Shabbat on Shabbat.
Abaye said: This is not difficult; this ruling is referring to the fourteenth of Nisan, whereas that ruling is referring to the thirteenth. The Gemara elaborates: On the thirteenth of Nisan, when bread is still found in every house, the weasel does not conceal the leaven, and therefore there is no concern that perhaps the weasel dragged the leaven elsewhere and concealed it. However, on the fourteenth of Nisan, when bread is not found in any of the houses, the weasel hides the leaven. Rava said in surprise: And is the weasel a prophetess that knows that now is the fourteenth of Nisan and no one will bake until the evening, and it leaves over bread and conceals it in its hole? Rather, Rava rejected Abaye’s answer and said: With regard to the leaven that one leaves after the search, he should place it in a concealed location, lest a weasel take it before us and it will require searching after it. Only if one actually sees the weasel take the leaven, is he required to search after it.