Leviticus 23:27-32

27Also on the tenth day of this seventh month there shall be a day of atonement: it shall be an holy convocation to you; and ye shall afflict your souls, and offer an offering made by fire to the LORD. 28And ye shall do no work in that same day: for it is a day of atonement, to make an atonement for you before the LORD your God. 29For whatever soul it may be that shall not be afflicted in that same day, he shall be cut off from among his people. 30And whatever soul it may be that doeth any work in that same day, the same soul will I destroy from among his people. 31Ye shall do no manner of work: it shall be a statute for ever throughout your generations in all your dwellings. 32It shall be to you a sabbath of rest, and ye shall afflict your souls: in the ninth day of the month at evening, from evening to evening, shall ye celebrate your sabbath.1