Leviticus 23:27-32

27“The tenth day of this seventh month is the Day of Atonement. You shall hold a sacred assembly and humble yourselves,1 and present a food offering to the LORD.

28On this day you are not to do any work, for it is the Day of Atonement, when atonement is made for you before the LORD your God. 29If anyone does not humble himself on this day, he must be cut off from his people. 30I will destroy from among his people anyone who does any work on this day.

31You are not to do any work at all. This is a permanent statute for the generations to come, wherever you live. 32It will be a Sabbath of complete rest for you, and you shall humble yourselves. From the evening of the ninth day of the month until the following evening you are to keep your Sabbath.”