Leviticus 23:27-32

23:27 “The tenth day of this seventh month is the Day of Atonement. It is to be a holy assembly for you, and you must humble yourselves and present a gift to the Lord. 23:28 You must not do any work on this particular day, because it is a day of atonement to make atonement for yourselves before the Lord your God. 23:29 Indeed, any person who does not behave with humility on this particular day will be cut off from his people. 23:30 As for any person who does any work on this particular day, I will exterminate that person from the midst of his people! 23:31 You must not do any work. This is a perpetual statute throughout your generations in all the places where you live. 23:32 It is a Sabbath of complete rest for you, and you must humble yourselves on the ninth day of the month in the evening, from evening until evening you must observe your Sabbath.”