Yom Kippur

Leviticus 23 (Jewish Publication Society 1917 Edition):

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