Leviticus 16:29-30

29“This shall be a statute forever for you: In the seventh month, on the tenth day of the month, you shall afflict your souls, and do no work at all, whether a native of your own country or a stranger who dwells among you.

30For on that day the priest shall make atonement for you, to cleanse you, that you may be clean from all your sins before the Lord.