Jews fast each year on the 10th day of Tishri which is the date of Yom Kippur, the Day of Atonement.
According to Wikipedia:
Jewish people traditionally observe this holy day with a 25-hour period of fasting and intensive prayer, often spending most of the day in synagogue services. Yom Kippur completes the annual period known in Judaism as the High Holy Days or Yamim Nora'im ("Days of Awe").
Two passages in Leviticus give God's instructions for this special day: Leviticus 16 and 23.
Leviticus 16:30 says, "For on this day shall atonement be made for you, to cleanse you; from all your sins shall ye be clean before the LORD."
The Scriptures prohibit Jews from 6 tasks on Yom Kippur. This list from Wikipedia includes the following:
- No eating or drinking
- No wearing of leather shoes
- No meetings
- No bathing or washing
- No anointing oneself with perfumes or lotions
- No marital relations
Besides being a day for repentance and reflection, some Jews set goals on this day, reports the Jerusalem Post.
For additional reading:
- The Gospel in the Day of Atonement
- Prayers at Jerusalem's Western Wall and selichot, ahead of Yom Kippur