Leviticus 23:40-43

40And 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.1 41And ye shall keep it a feast to 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. 42Ye shall dwell in booths seven days; all that are Israelites born shall dwell in booths: 43That your generations may know that I made the children of Israel to dwell in booths, when I brought them out of the land of Egypt: I am the LORD your God.