Leviticus 23:42

40You shall take on the first day the fruit of majestic trees, branches of palm trees, and boughs of thick trees, and willows of the brook; and you shall rejoice before the LORD your God seven days.

41You 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.

42You shall dwell in temporary shelters for seven days. All who are native-born in Israel shall dwell in temporary shelters,

43that your generations may know that I made the children of Israel to dwell in temporary shelters when I brought them out of the land of Egypt. I am the LORD your God.’”

44So Moses declared to the children of Israel the appointed feasts of the LORD.