"For seven days you shall bring an offering by fire near to Yahweh. On  the eighth day you shall have a holy convocation and bring an offering  by fire near to Yahweh; it is a solemn assembly. You shall do no  laborious work." Leviticus 23:36

"‘On exactly the fifteenth day of the seventh month, when you have gathered in the produce of the land, you shall celebrate the feast of Yahweh for seven days, with a rest on the first day and a rest on the eighth day." Leviticus 23:39