Beginning of new Hebrew month of Tevet. Tevet is the 10th month of the Hebrew year. Corresponds to December or January on the Gregorian calendar

https://www.hebcal.com/holidays/rosh-chodesh-tevet-2023?utm_source=js&utm_medium=icalendar

Hanukkah, the Jewish festival of rededication. Also known as the Festival of Lights
Torah: Numbers 28:1-28:15; 7:42-7:47

https://www.hebcal.com/holidays/chanukah-2023?utm_source=js&utm_medium=icalendar