Leviticus 16:29-31

Leeser(i) 29 And it shall be unto you a statute for ever: in the seventh month, on the tenth of the month, ye shall afflict yourselves by fasting, and no work shall ye do, whether it be one of your own country, or the stranger that sojourneth among you; 30 For on that day shall the high-priest make an atonement for you, to cleanse you; from all your sins before the Lord shall ye be clean. 31 It shall be a sabbath of rest unto you, and ye shall afflict yourselves by fasting, as a statute for ever.