Leviticus 23:39

39 “ ‘So beginning with the fifteenth day of the seventh month, after you have gathered the crops of the land, celebrate the festival to the LORD for seven days; the first day is a day of sabbath rest, and the eighth day also is a day of sabbath rest.

Read Leviticus 23:39 Using Other Translations

Also in the fifteenth day of the seventh month, when ye have gathered in the fruit of the land, ye shall keep a feast unto the LORD seven days: on the first day shall be a sabbath, and on the eighth day shall be a sabbath.
"On the fifteenth day of the seventh month, when you have gathered in the produce of the land, you shall celebrate the feast of the LORD seven days. On the first day shall be a solemn rest, and on the eighth day shall be a solemn rest.
“Remember that this seven-day festival to the LORD —the Festival of Shelters—begins on the fifteenth day of the appointed month, after you have harvested all the produce of the land. The first day and the eighth day of the festival will be days of complete rest.