Carrying Branches To Make Booths (illustration from the 1897 Bible Pictures and What They Teach Us by Charles Foster) (Photo credit: Wikipedia)
The Six Minor Days
Only the first of the seven days of this feast was 'a holy convocation'; the other six were 'minor festivals.' On each day, besides the ordinary morning and evening sacrifices, the festive offerings prescribed in Numbers 29:12-38 were brought. The Psalms sung at the drink-offering after the festive sacrifices (or Musaph, as they are called), were, for the first day of the feast, Psalm 105; for the second, Psalm 29; for the third, Psalm 50, from verse 16; for the fourth, Psalm 94, from verse 16; for the fifth, Psalm 94, from verse 8; for the sixth, Psalm 81, from verse 6; for the last day of the feast, Psalm 82, from verse 5. As the people retired from the altar at the close of each day's service, they exclaimed, 'How beautiful art thou, O altar!'—, according to a later version, 'We give thanks to Jehovah and to thee, O altar!' All the four-and-twenty orders of the priesthood were engaged in the festive offerings, which were apportioned among them according to definite rules, which also fixed how the priestly dues were to be divided among them. Lastly, in every sabbatical year the Law was to be publicly read on the first day of the feast (Deut 31:10-13). *
* In later times only certain portions were read, the law as a whole being sufficiently known from the weekly prelections in the synagogues.
On the afternoon of the seventh day of the feast the people began to remove from the 'booths.' For at the Octave, on the 22nd of Tishri, they lived no longer in booths, nor did they use the lulav. But it was observed as 'a holy convocation'; and the festive sacrifices prescribed in Numbers 29:36-38 were offered, although no more by all the twenty-four courses of priests, and finally the 'Hallel' sung at the drink-offering.
The Pouring and Lighting Post-Mosaic
It will have been observed that the two most important ceremonies of the Feast of Tabernacles— pouring out of water and the illumination of the Temple— of post-Mosaic origin. According to Jewish tradition, the pillar of cloud by day and of fire by night had first appeared to Israel on the 15th of Tishri, the first day of the feast. On that day also Moses was said to have come down from the Mount, and accounted to the people that the Tabernacle of God was to be reared among them. We know that the dedication of Solomon's Temple and the descent of the Shechinah took place at this feast (1 Kings 8; 2 Chron 7). Nor can we greatly err in finding an allusion to it in this description of heavenly things: 'After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands; and cried with a loud voice, saying, Salvation to our God, which sitteth upon the throne, and unto the Lamb' (Rev 7:9,10).
Whether or not our suggestions be adopted as to the typical meaning of the two great ceremonies of the 'pouring out of the water' and the Temple illumination, the fact remains, that the Feast of Tabernacles is the one only type in the Old Testament which has not yet been fulfilled.
Read the entire article on the Feast here