The Hebrew name for “assembly of the eighth [day]” (Lev. 23:39) is שְׁמִינִי עֲצֶרֶת Shemeni Atseret. Functionally, it’s the “last” day of the seven-day festival of ingathering, or Sukkot (Tabernacles).
The annual memorial of Sukkot recalls the transition from Yisrael’s wandering in the wilderness in tents for 40 years, and Shemini Atzeret may point to the new beginning in permanent homes in the Land after crossing the Yarden (Jordan).
This new beginning is likened to entering God’s eternal rest (Psalm 95; Hebrews 3–4). Symbolized by Ha’aretz (“the Land”), this “rest” is points forward to a time when Heaven and humanity are reunited in “the Kingdom,” also known as the messianic age.