Leviticus 23:28-32

28On this particular day you are not to do any work, for it is a Day of Atonement to make atonement for yourselves before the Lord your God.

29If any person does not practice self-denial on this particular day, he is to be cut off from his people.

30I will destroy among his people anyone who does any work on this same day.

31You are not to do any work. This is a permanent statute throughout your generations wherever you live.

32It will be a Sabbath of complete rest for you, and you must practice self-denial. You are to observe your Sabbath from the evening of the ninth day of the month until the following evening.”