Speak unto the children of Israel, saying, The fifteenth day of this seventh month shall be the feast of tabernacles for seven days unto the LORD.

Wesley's Notes

23:34 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 compleatly brought in.

Jamieson-Fausset-Brown Bible Commentary

34-44. the feast of tabernacles, for seven days unto the Lord-This festival, which was instituted in grateful commemoration of the Israelites having securely dwelt in booths or tabernacles in the wilderness, was the third of the three great annual festivals, and, like the other two, it lasted a week. It began on the fifteenth day of the month, corresponding to the end of our September and beginning of October, which was observed as a Sabbath; and it could be celebrated only at the place of the sanctuary, offerings being made on the altar every day of its continuance. The Jews were commanded during the whole period of the festival to dwell in booths, which were erected on the flat roofs of houses, in the streets or fields; and the trees made use of are by some stated to be the citron, the palm, the myrtle, and the willow, while others maintain the people were allowed to take any trees they could obtain that were distinguished for verdure and fragrance. While the solid branches were reserved for the construction of the booths, the lighter branches were carried by men, who marched in triumphal procession, singing psalms and crying "Hosanna!" which signifies, "Save, we beseech thee!" (Ps 118:15, 25, 26). It was a season of great rejoicing. But the ceremony of drawing water from the pool, which was done on the last day, seems to have been the introduction of a later period (Joh 7:37). That last day was the eighth, and, on account of the scene at Siloam, was called "the great day of the feast." The feast of ingathering, when the vintage was over, was celebrated also on that day [Ex 23:16; 34:22], and, as the conclusion of one of the great festivals, it was kept as a sabbath.

Matthew Henry's Concise Commentary

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.