Exodus 34:22 And thou shalt observe the feast of weeks, of the first-fruits of wheat harvest, and the feast of in-gathering at the year's end.
[Patriarchs & Prophets pp 540] The Pentecost occupied but one day, which was devoted to religious service. In the seventh month came the Feast of Tabernacles, or of in-gathering. This feast acknowledged God's bounty in the products of the orchard, the olive grove, and the vineyard. It was the crowning festal gathering of the year. The land had yielded its increase, the harvests had been gathered into the granaries, the fruits, the oil, and the wine had been stored, the first fruits had been reserved, and now the people came with their tributes of thanksgiving to God, who had thus richly blessed them.
This feast was to be pre-eminently an occasion of rejoicing. It occurred just after the great Day of Atonement, when the assurance had been given that their iniquity should be remembered no more. At peace with God, they now came before Him to acknowledge His goodness and to praise Him for His mercy. The labors of the harvest being ended, and the toils of the new year not yet begun, the people were free from care, and could give themselves up to the sacred, joyous influences of the hour.
Though only the fathers and sons were commanded to appear at the feasts, yet, so far as possible, all the household were to attend them, and to their hospitality the servants, the Levites, the stranger, and the poor were made welcome. Like the Passover, the Feast of Tabernacles was commemorative. In memory of their pilgrim life in the wilderness the people were now to leave their houses and dwell in booths, or arbors, formed from the green branches “of goodly trees, branches of palm trees, and the boughs of thick trees, and willows of the brook.” Leviticus 23:40, 42, 43.
Leviticus 23:42 Ye shall dwell in booths seven days; all that are Israelites born shall dwell in booths: 43 That 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.
May God add His blessing to the study of His word. “Good night” and God bless!