39 Now, the fifteenth day of the seventh month, when you have gathered in the produce of the land, you shall keep the festival of the Lord, lasting seven days; a complete rest on the first day, and a complete rest on the eighth day. 40 On the first day you shall take the fruit of majestic trees, branches of palm trees, boughs of leafy trees, and willows of the brook; and you shall rejoice before the Lord your God for seven days. 41 You shall keep it as a festival to the Lord seven days in the year; you shall keep it in the seventh month as a statute forever throughout your generations. 42 You shall live in booths for seven days; all that are citizens in Israel shall live in booths, 43 so that your generations may know that I made the people of Israel live in booths when I brought them out of the land of Egypt: I am the Lord your God.
Matthew Henry's Commentary on Leviticus 23:39-43
Commentary on Leviticus 23:33-44
(Read Leviticus 23:33-44)
In the feast of Tabernacles there was a remembrance of their dwelling in tents, or booths, in the wilderness, as well as their fathers dwelling in tents in Canaan; to remind them of their origin and their deliverance. Christ's tabernacling on earth in human nature, might also be prefigured. And it represents the believer's life on earth: a stranger and pilgrim here below, his home and heart are above with his Saviour. They would the more value the comforts and conveniences of their own houses, when they had been seven days dwelling in the booths. It is good for those who have ease and plenty, sometimes to learn what it is to endure hardness. The joy of harvest ought to be improved for the furtherance of our joy in God. The earth is the Lord's, and the fullness thereof; therefore whatever we have the comfort of, he must have the glory of, especially when any mercy is perfected. God appointed these feasts, "Beside the sabbaths and your free-will offerings." Calls to extraordinary services will not excuse from constant and stated ones.