Bava Kamma 82B

ואתא איהו תיקן חפיפה.

And Ezra came and added to the Torah’s minimal obligation. He instituted the requirement of combing the hair even when it is known that it is not knotted and contains no repulsive substance.

ושיהו רוכלין מחזרין בעיירות ⁠– משום תכשיטי נשים, כדי שלא יתגנו על בעליהם.

The Talmud discusses the next of Ezra’s ordinances: And that peddlers should circulate through all the towns. This Talmud explains that this is because peddlers supply women’s cosmetics, and therefore Ezra instituted this practice so that women should not become unattractive to their husbands.

ותיקן טבילה לבעלי קריין ⁠– דאורייתא הוא! דכתיב: ״ואיש כי תצא ממנו שכבת זרע, ורחץ את בשרו במים״! דאורייתא הוא לתרומה וקדשים; אתא הוא, תיקן אפילו לדברי תורה.

The Talmud analyzes the last of the 10 ordinances: And he instituted the requirement of immersion for those who experienced a seminal emission. The Talmud asks: But this is required by Torah law, as it is written: “And if the flow of seed go out from a man, then he should bathe all his flesh in water” (Leviticus 15:16). The Talmud answers: By Torah law immersion is required only if one wishes to partake of teruma or sacrificial meat. Ezra came and further instituted that immersion is necessary even for reciting or studying matters of Torah.

עשרה דברים נאמרו בירושלים: אין הבית חלוט בה; ואינה מביאה עגלה ערופה; ואינה נעשית עיר הנדחת;

§ The Mishnah teaches that one may not raise chickens in Jerusalem. The Talmud cites a baraita that contains a list of other halakhot that are unique to Jerusalem. 10 matters were stated with regard to Jerusalem: A house situated in Jerusalem does not become irredeemable one year after its sale. Those who sell houses in other walled cities have the right to buy back their property for one year after the transaction. If they fail to do so, the house becomes the permanent possession of the buyer (see Leviticus 25:29–30). This halakha does not apply to houses in Jerusalem. And its Elders do not bring a heifer whose neck is broken as required when a murder victim is found near a city and the murderer is unknown (see Deuteronomy 21:1–9); and it cannot become an idolatrous city (see Deuteronomy 13:13–19).