Leviticus 23:31

Of tabernacles Of tents, or booths, or arbours. This feast was appointed to remind them of that time when they had no other dwellings in the wilderness, and to stir them up to bless God, as well for the gracious protection then afforded them, as for the more commodious habitations now given them; and to excite them to gratitude for all the fruits of the year newly ended, which were now completely brought in.