Leviticus 23:33

29 If anyone does not humble himself on this day, he must be cut off from his people.

30 I will destroy from among his people anyone who does any work on this day.

31 You are not to do any work at all. This is a permanent statute for the generations to come, wherever you live.

32 It 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.”

33 And the LORD said to Moses,

34 “Speak to the Israelites and say, ‘On the fifteenth day of the seventh month the Feast of Tabernacles to the LORD begins, and it continues for seven days.

35 On the first day there shall be a sacred assembly. You must not do any regular work.

36 For seven days you are to present an offering made by fire to the LORD. On the eighth day you are to hold a sacred assembly and present an offering made by fire to the LORD. It is a solemn assembly; you must not do any regular work.

37 These are the LORD’s appointed feasts, which you are to proclaim as sacred assemblies for presenting offerings by fire to the LORD—burnt offerings and grain offerings, sacrifices and drink offerings, each on its designated day.

Read all of Leviticus 23