Chief Rabbi Sir Ephraim Mirvis has called for all who are able to “commit to a day of prayer and fasting” on Friday.
In a statement on X/Twitter, the chief rabbi said that this year the fast is a “spiritual response” to contemporary human suffering.
Tevet 10 falls on December 22 and is known as Asarah Betevet, one of six public fast days in the Jewish calendar.
Mirvis said: “The day recalls a time when the ancient City of Jerusalem came under threat”.