Leviticus 23:33

31You shall do no kind of work: it is a statute forever throughout your generations in all your dwellings.

32It shall be a Sabbath of solemn rest for you, and you shall deny yourselves. In the ninth day of the month at evening, from evening to evening, you shall keep your Sabbath.”

33The LORD spoke to Moses, saying,

34“Speak to the children of Israel, and say, ‘On the fifteenth day of this seventh month is the feast of booths for seven days to the LORD.

35On the first day shall be a holy convocation. You shall do no regular work.