MISHNA: The measure that determines liability for carrying out a bone is equivalent to that which is used to make a spoon. Rabbi Yehuda says: In a measure equivalent to that which is used to make from it a key. The measure that determines liability for carrying out glass is equivalent to that which is used to scrape and smooth the top of a bobbin, a sharpened stick used by weavers. The measure that determines liability for carrying out a pebble or a stone is equivalent to that which is used to throw at a bird to chase it away. Rabbi Elazar bar Ya’akov says: Equivalent to that which is used to throw at an animal, which is larger.

GEMARA: The Gemara asks: Is that to say that the measure of Rabbi Yehuda is greater? Don’t we maintain that the measure of the Rabbis is greater? Ulla said: Rabbi Yehuda did not refer to the entire key, but to the teeth of a key. With regard to the above, the Gemara cites that which the Sages taught in a baraita: The teeth of a key are ritually pure, and they cannot become impure when separate from the key, as they have no function on their own. However, if one affixed them to a key, they can become ritually impure as part of a utensil. And teeth of a lock, even though one attached them to the door and affixed them with nails, are ritually pure, as anything attached to the ground has the same legal status as the ground itself, which cannot become ritually impure.

We learned in the mishna: The measure that determines liability for carrying out glass is equivalent to that which is used to scrape and smooth the top of a bobbin. A tanna taught that halakha in a Tosefta in a different manner: The measure that determines liability for carrying out glass is equivalent to that which is used to cut two threads at once, as a glass shard can be used in place of a knife.

We learned in the mishna: The measure that determines liability for carrying out a pebble or a stone is equivalent to that which is used to throw at a bird to chase it away. Rabbi Elazar ben Ya’akov says: Equivalent to that which is used to throw at an animal. Rabbi Ya’akov said that Rabbi Yoḥanan said: And that is only if the stone is large enough that the animal feels it. And how much is the measure of that stone? It was taught in a baraita: Rabbi Elazar ben Ya’akov says: A weight of ten zuz.

The Gemara relates: Zunin entered the study hall and said to the Sages: My teachers, with regard to stones that may be moved on Shabbat for wiping in the bathroom, how much is their measure? They said to him: Stones of only three sizes may be moved for that purpose: An olive-bulk, a nut-bulk, and an egg-bulk. He said to them: And will he take scales [turtani] into the bathroom to weigh each stone? They were counted and the Sages concluded that one need not measure the stones. He simply takes a handful of stones. It was taught in a baraita: Rabbi Yosei says the measure of bathroom stones is an olive-bulk, a nut-bulk, and an egg-bulk. Rabbi Shimon, son of Rabbi Yosei, says in the name of his father: One need not measure the stones. He simply takes a handful of stones.

Our Sages taught in a baraita with regard to Shabbat: Three sharpened stones may be taken into the bathroom. And what is their measure? Rabbi Meir says: A nut-bulk; Rabbi Yehuda says: An egg-bulk. Rafram bar Pappa said that Rav Ḥisda said: Like the dispute here, so too, there is a dispute between these Sages with regard to the minimum size of a citron. The Gemara is surprised at the comparison. Why does the Gemara cite this baraita as a mnemonic to recall the dispute about the size of a citron? There, with regard to a citron, it is a mishna that is known by all; here it is a baraita, which is more obscure and more likely to require a mnemonic and a comparison to a more popular source. Rather, the phrasing is reversed: Like the dispute with regard to a citron, so too, there is a dispute here.

Rav Yehuda said: However, one may not move the payis for use in a bathroom. The Gemara asks: What is the meaning of payis? Rabbi Zeira said: It refers to clods of Babylonian earth, which is soft and flaky. Rava said: It is prohibited to manipulate the anus with a stone on Shabbat to help discharge bodily functions in the manner that one manipulates it on weekdays. Mar Zutra strongly objected to this: According to Rava, should one endanger himself by refraining from relieving himself? The Gemara explains: He meant he should do so in an unusual manner and not in the manner it is typically done. With regard to the size of stones, Rabbi Yannai said: If he has a fixed place for a bathroom, he may take a handful of stones; if he does not need them on Shabbat, he can use them on another occasion. If he does not have a fixed place he may bring in an average size stone, which is the size of a small mortar used for crushing spices. Rav Sheshet said: If the stone has an indication on it that it has already been used in the bathroom, one is permitted to move it for that purpose on Shabbat, regardless of its size.

The Gemara raises an objection: Is it permitted to wipe with a stone that was already used? Didn’t the Sages say: Ten things bring a person to suffer from hemorrhoids and they are: One who eats the leaves of bulrushes, grape leaves, tendrils of grapevines, the palate and tongue of an animal, as well as any other part of the animal which is not smooth and which has protrusions, without salt, the spine of a fish, a salty fish that is not fully cooked, and one who drinks wine dregs, and one who cleans himself with lime and clay, the materials from which earthenware is made, and one who cleans himself with a stone with which another person has cleaned himself. And some say: One who suspends himself in the bathroom as well. Apparently, using a previously used stone is dangerous to one’s health. The Gemara answers: This is not difficult. Here, where it is prohibited, is referring to a case where the stone is still moist. Here, where it is permitted, is referring to a case where the stone is dry. And if you wish, say instead that here, where it is prohibited, is referring to one side, using the side that was already used; here, where it is permitted, is referring to both sides, using the other side of the same stone. And if you wish, say instead that this, where it is permitted, is referring to one’s own stone, which he used to clean himself; this, where it is prohibited, is referring to another person’s stone, which poses a danger.

Abaye said to Rav Yosef: What is the ruling if rain fell on the stone and the indications that it had been used previously in the bathroom were obscured? The dilemma is: Is moving it permitted like a stone that is designated for use in the bathroom on Shabbat, or, is moving it prohibited since its indications were obscured and it might have the legal status of set-aside? Rav Yosef said to him: If indication on them is apparent, even though it is partially obscured, it is permitted, since the stone remains clear that it is designated for use in the bathroom.

Rabba bar Rav Sheila raised a dilemma before Rav