Leviticus 23:26-31

The Day of Atonement

26And the Lord spoke to Moses, saying, 27Now aon the tenth day of this seventh month is the Day of Atonement. It shall be for you a time of holy convocation, and you shall afflict yourselves
Or  shall fast; also verse 32
and present a food offering to the Lord.
28And you shall not do any work on that very day, for it is a Day of Atonement, to make atonement for you before the Lord your God. 29For whoever is not afflicted on that very day cshall be cut off from his people. 30And whoever does any work on that very day, that person I will destroy from among his people. 31You shall not do any work. It is a statute forever throughout your generations in all your dwelling places.
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