Shabbat 52A

דתיתותב דעתיה. אמר ליה: חמור שעסקיו רעים כגון זה, מהו לצאת בפרומביא בשבת? אמר ליה: הכי אמר אבוך משמיה דשמואל: הלכה כחנניא.

he will be placated and will understand that it was not my intention to disrespect him. He said to him: An undisciplined donkey whose conduct is wicked like this one that I am riding, what is the ruling with regard to having it go out with a halter on Shabbat? Typically, in order to secure a donkey, a bit suffices and it does not require a halter. A halter constitutes excessive security. However, the question is whether or not a halter that provides excessive security for a wild donkey like this one is considered a burden with which it is prohibited to go out to the public domain on Shabbat. Rabba bar Rav Huna said to him: Even if the security is considered extraneous, your father said the following in the name of Shmuel: The halakha is in accordance with the opinion of Ḥananya, who said that a device that provides excessive security is not considered a burden.

תנא דבי מנשיא: עז שחקק לה בין קרניה יוצאה באפסר בשבת. בעי רב יוסף: תחב לה בזקנה מהו? כיון דאי מנתח לה כאיב לה לא אתיא לנתוחה, או דילמא זימנין דרפי ונפיל, ואתי לאתויי ארבע אמות ברשות הרבים. תיקו.

A Sage of the school of Menashiya taught a baraita: A goat in which one carved out a hole between its horns may go out with a bit on Shabbat. Because the bit is inserted through the hole, it will not become detached. Rav Yosef raised a dilemma: What is the ruling in a case where one inserted the bit through the goat’s beard? The Talmud explains the dilemma: Is the halakha that since, if the goat attempts to sever itself from the bit, it would cause it pain because the bit is attached to its beard, and therefore it will not come to sever it and the bit will remain in place? Or perhaps is the halakha that sometimes the knot will loosen and the bit will fall, and the goat’s owner will come to bring the bit and carry it 4 cubits in the public domain? No resolution was found to this dilemma. Let it stand unresolved.