Leviticus 23:41-43

41You are to celebrate this as a feast to the LORD for seven days each year. This is a permanent statute for the generations to come; you are to celebrate it in the seventh month.

42You are to dwell in booths1 for seven days. All the native-born of Israel must dwell in booths, 43so that your descendants may know that I made the Israelites dwell in booths when I brought them out of the land of Egypt. I am the LORD your God.’”