Leviticus 23:34; Leviticus 23:42-43

34 “Say to the Israelites: ‘On the fifteenth day of the seventh month the LORD’s Festival of Tabernacles begins, and it lasts for seven days.
42 Live in temporary shelters for seven days: All native-born Israelites are to live in such shelters 43 so your descendants will know that I had the Israelites live in temporary shelters when I brought them out of Egypt. I am the LORD your God.’ ”