10 of tevet , a winter fast

https://www.chabad.org/library/article_cdo/aid/102698/jewish/Asarah-BTevet-Tevet-10.htm




What happened on 10th of Tevet?


The fasting is in mourning of the siege of Jerusalem by Nebuchadnezzar II of Babylonia—an event that began on that date and ultimately culminated in the destruction of Solomon's Temple (the First Temple), downfall of the Kingdom of Judah, and the Babylonian exile of the Jewish people.


https://www.chabad.org/library/article_cdo/aid/4980141/jewish/10-Facts-About-the-Tenth-of-Tevet.htm



1. It Marks the Start of the Babylonian Siege

2. The Date Was Recorded by Ezekiel
Ezekiel tells us: “The word of the L‑rd came to me in the ninth year,1 in the tenth month, on the tenth of the month, saying: ‘Son of man, write for yourself the name of the day, this very day; the king of Babylon has besieged Jerusalem on this very day.’ ”2

. The Fast Is Listed by Zechariah

The Prophet Zechariah records the following message he received from G‑d: The fast of the fourth [month], the fast of the fifth [month], the fast of the seventh [month], and the fast of the tenth [month] shall be for the house of Judah for joy and happiness



5. It’s the Shortest Fast (in Northern
9. ...As Well As the Passing of Ezra

Ezra the Scribe passed away on 9 Tevet of the year 3448 (313 BCE), exactly 1,000 years after the giving of the Torah on Mount Sinai.
Ezra led the return of the Jewish people to the Land of Israel after the Babylonian exile, oversaw the building of the Second Temple, and helped put a stop to the wave of intermarriage that afflicted the Jews at that time. As head of the Great Assembly, he canonized the

24 books of the Holy Scriptures (Tanach) and legislated a series of laws and practices, including formalized prayer, guaranteeing the continuation of authentic Judaism among the Jewish people to this very day.Hemisphere)

. . .