Jealousy among teachers increases wisdom.

Rav Naḥman bar Yitzḥak said: And Rav Huna, son of Rav Yehoshua, who said that townspeople can bar craftsmen who come from other cities, concedes with regard to perfume salesmen who travel from one town to another that the townspeople cannot prevent them from entering their town. As the Master said: Ezra instituted an ordinance for the Jewish people that perfume salesmen shall travel from town to town so that cosmetics will be available to Jewish women. Since this ordinance was instituted on behalf of Jewish women, the Sages ruled that these peddlers could not be barred from entering a town.

The Gemara continues: And this matter applies only to one who seeks to travel from town to town as a salesman. But if he wants to establish a shop, this ruling was not stated, and the townspeople can prevent him from doing so. And if he is a Torah scholar he may even establish a shop as a perfume salesman. This is like that incident in which Rava permitted Rabbi Yoshiya and Rav Ovadya to establish a shop not in accordance with the halakha. What is the reason for this ruling? The reason is that since they are rabbis, they are likely to be distracted from their studies should they be required to travel from place to place.

§ The Gemara relates: There were these basket sellers who brought baskets to Babylonia. The townspeople came and prevented them from selling there. The two parties came before Ravina for a ruling. Ravina said to them: The basket sellers came from outside the town, and they sell to those from outside the town, i.e., to guests who are not residents of the town. The Gemara comments: And this statement applies only on a market day, when people from other towns come to shop, but they may not sell their wares on non-market days. And even with regard to market days, we say so only with regard to selling in the market, but this halakha does not apply to circulating around the town.

The Gemara further relates: There were these wool sellers who brought wool to the city of Pum Nahara. The townsfolk came and prevented them from selling it. The two parties came before Rav Kahana for a ruling. Rav Kahana said to them: The halakha is that they may prevent you from selling your wares. The wool sellers said to him: We have debts to collect in the city, and we must sell our wares in the meantime to sustain ourselves until we are paid. Rav Kahana said to them: Go and sell the amount needed to sustain yourselves until you have collected your debts, and then leave.

§ The Gemara relates: Rav Dimi of Neharde’a brought dried figs on a ship to sell them. The Exilarch said to Rava: Go and see; if he is a Torah scholar, reserve the market for him, i.e., declare that he has the exclusive right to sell dried figs. Rava said to his student Rav Adda bar Abba: Go and smell his jar, i.e., determine whether or not Rav Dimi is a Torah scholar.

Rav Adda bar Abba went and asked Rav Dimi a question: With regard to an elephant that swallowed a wicker basket and excreted it intact along with its waste, what is the halakha? Is the vessel still susceptible to ritual impurity or is it considered digested and not susceptible to impurity? An answer was not available to Rav Dimi. Rav Dimi said to Rav Adda bar Abba: Is the Master Rava, i.e., are you Rava, as you have asked me such a difficult question? Rav Adda bar Abba struck him on his shoe in a disparaging way and said to him: There is a great difference between me and Rava; but I am perforce your teacher, and Rava is your teacher’s teacher.

Based on this exchange, Rav Adda bar Abba decided that Rav Dimi was not a great Torah scholar, and therefore he did not reserve the market for him, and Rav Dimi lost his dried figs, as they rotted. Rav Dimi came before Rav Yosef to complain, and said to him: The Master should see what they did to me. Rav Yosef said to him: He Who did not delay retribution for the humiliation of the King of Edom should not delay His response to your humiliation, but should punish whoever distressed you, as it is written: “So says the Lord: For three transgressions of Moab, indeed for four I will not reverse for him, because he burned the bones of the King of Edom into lime” (Amos 2:1).

The Gemara reports that Rav Adda bar Abba died. Rav Yosef said: I punished him, i.e., I am to blame for his death, as I cursed him. Rav Dimi from Neharde’a said: I punished him, as he caused my loss of dried figs. Abaye said: I punished him, i.e., he was punished on my account because he did not exhibit the proper respect for me. As Rav Adda bar Abba said to the Sages: Instead of gnawing the bones in the school of Abaye, you would do better to eat fatty meat in the school of Rava, i.e., it is preferable to study with Rava than with Abaye. And Rava said: I punished him, as when he would go to the butcher to buy a piece of meat, he would say to the butchers: I will take meat before Rava’s servant, as I am greater than he is.

Rav Naḥman bar Yitzḥak said: I punished him, i.e., he was punished because of me, as Rav Naḥman bar Yitzḥak was the head of the kalla lectures, the gatherings for Torah study during Elul and Adar. Rav Naḥman bar Yitzḥak would teach the students immediately following the lesson taught by the head of the academy. Every day, before he went in for the kalla lecture, he reviewed his lecture with Rav Adda bar Abba, and then he would enter the study hall for the kalla lecture.

On that day Rav Pappa and Rav Huna, son of Rav Yehoshua, seized Rav Adda bar Abba, because they had not been present at the conclusion of Rava’s lecture. They said to him: Tell us how Rava stated these halakhot of animal tithe. Rav Adda bar Abba said to them: Rava said this and Rava said that. Meanwhile, it grew late for Rav Naḥman bar Yitzḥak, and Rav Adda bar Abba had not yet arrived.

The Sages said to Rav Naḥman bar Yitzḥak: Arise and teach us, as it is late for us. Why does the Master sit and wait? Rav Naḥman bar Yitzḥak said to them: I am sitting and waiting for the bier of Rav Adda bar Abba, who has presumably died. Meanwhile, a rumor emerged that Rav Adda bar Abba had indeed died. The Gemara comments: And so too, it is reasonable to conclude that Rav Naḥman bar Yitzḥak punished him, i.e., he died as a result of Rav Naḥman bar Yitzḥak’s statement, as the unfortunate event occurred just as he announced that Rav Adda bar Abba’s bier was on its way.

MISHNA: One whose wall was close to the wall of another may not build another wall close to the neighbor’s wall unless he distances it four cubits from the wall of the neighbor. And one who desires to build a wall opposite the windows of a neighbor’s house must distance the wall four cubits from the windows, whether above, below, or opposite.

GEMARA: The Gemara comments: Before addressing the construction of the second wall, one could ask: And with regard to the first man, how did he place his wall close to the neighbor’s wall in the first place? Rav Yehuda said that this is what the tanna is saying: