The 8th day holds profound significance as a holy day distinct from the preceding seven days of Tabernacles, marked by a sacred assembly and a Sabbath rest as commanded in Leviticus 23:36 and 23:39. Unlike the seven days, which emphasize rejoicing and dwelling in temporary booths, the 8th day shifts focus, with reduced sacrifices as noted in Numbers 29, indicating a different purpose. This day, often associated with a sacred assembly or "atsarett," carries connotations of closing, restraint, and retaining, suggesting a solemn reflection on the lessons and experiences of the feast to carry them forward into daily life. The number eight itself, derived from a Hebrew root meaning abundance or overabundance, signifies something beyond the perfection of seven, representing superabundance, regeneration, and new beginnings. Biblically, the 8th day often marks a culmination or a fresh start, as seen in Genesis 17:12 with circumcision on the 8th day symbolizing a new life under God's covenant with Abraham. Similarly, in Exodus 22:30, the firstborn of oxen and sheep are dedicated to God on the 8th day, showing it as a day when God receives His portion. In Leviticus 14, the cleansing of a leper concludes on the 8th day with offerings and a return to society, reflecting renewal. Numbers 6 describes a Nazarite's rededication on the 8th day after cleansing, and Leviticus 8-9 details the consecration of priests over seven days, culminating on the 8th day with God's appearance and acceptance of their offerings, highlighting superabundance and divine presence. This pattern of seven days of preparation followed by an 8th day of fulfillment underscores the 8th day as a time of dedication, new beginnings, and God receiving His due, whether it be through offerings, people, or priests. The 8th day of Tabernacles echoes this, serving as a reminder of consecration and God's acceptance of His people as His portion, urging reflection on spiritual growth and renewed service to Him with the abundance He provides.

The Eighth Day, observed immediately following the Feast of Tabernacles, holds profound significance as the seventh and final festival of the year. It represents a time beyond the Millennium, a period of immense salvation when most of mankind—rich and poor, young and old, free and slave, men and women—will be resurrected with the opportunity to inherit eternal life. Billions will qualify to enter the God Family, while those who refuse to repent and submit to God's way will face the Lake of Fire and the second eternal death. This festival, occurring on the twenty-second day of Tishri, is intimately connected to the Feast of Tabernacles yet carries a distinct meaning. The number eight, tied to a Hebrew root word meaning fatness, implies abundance, fertility, and surplus, even touching on themes of rebirth, resurrection, and regeneration. As a sacred assembly, or atzeret, the Eighth Day signifies a closing and retaining of the holy day observances, urging worshippers to hold fast to the instructions received. The Eighth Day foreshadows the Great White Throne Judgment, a time when God will resurrect the vast majority of humanity to mortal life, offering them the chance to accept salvation. This period follows the conditions of the Millennium, continuing themes of God's government, peace, and prosperity. During this time, a second, massive resurrection will occur, raising to physical life all those from 6,000 years of human history who never had the opportunity for salvation. Both Israel and uncalled Gentiles will receive equal opportunities to satisfy God's judgment and potentially gain eternal life with spiritual bodies. Those who persist in rebellion will face the Lake of Fire, a merciful and permanent end. God will judge those in this second resurrection by the same standard as true Christians today, granting them time to learn, obey, and overcome. Following this judgment, God will create a new heaven and a new earth, a pure world where death, sorrow, crying, and pain will cease forever. Those who have accepted God's way will be glorified as members of the God Family, living eternally to create, beautify, and extend God's rule across the universe.