Leviticus 23:41 in the World English Bible
You shall keep it as a feast to the LORD seven days in the year. It is a statute forever throughout your generations. You shall keep it in the seventh month.
Context
40 And ye shall take you on the first day the boughs of goodly trees, branches of palm trees, and the boughs of thick trees, and willows of the brook; and ye shall rejoice before the LORD your God seven days.
41 And ye shall keep it a feast unto the LORD seven days in the year. It shall be a statute for ever in your generations: ye shall celebrate it in the seventh month.
42 Ye shall dwell in booths seven days; all that are Israelites born shall dwell in booths: