Sigh... Here we go again...
Hebrews 4:9 says:
There remaineth therefore a rest to the people of God. Hebrews 4:9 (KJV)
Consequently a sabbath rest remains for the people of God. Hebrews 4:9 (LEB)
A literal translation of this verse says:
Consequently, a keeping of a sabbath is left to GOD's people. Hebrews 4:9
The Greek word translated
rest and
sabbath rest above is σαββατισμός (sabbatismos, G4520), which is a noun meaning a
keeping of a sabbath. It can refer to a kept weekly sabbath (Exodus 20:8), a kept 7-year land sabbath (Leviticus 25:2), or a kept festival (appointed time) sabbath (Leviticus 25:32). Scriptural context determines the type of sabbath.
It is an unusual word that is used only one time in the NT (Hebrews 4:9), not at all in the Greek Septuagint (LXX), and very rarely in other ancient writings. The verb form of this word is σαββατίζω (sabbatizo), which means
to keep a sabbath. It is not used in the New Testament, but is used in the LXX to refer to keeping all three types of sabbaths listed above (weekly, 7-year land, appointed time).
The context of chapters 3 and 4 in Hebrews is not a weekly sabbath, nor a 7-year land sabbath, but the sabbath rest of the land promised to Israel, which many under Moses were not able to enter into because of unbelief. In fact, the weekly sabbath is not even mentioned in Hebrews 4.
The most interesting usage of σαββατίζω (sabbatizo, to keep a sabbath) in the LXX is in Leviticus 23:32 where Israel is commanded yearly to keep the sabbath of the day of atonement. This appointed time was a sabbath of sabbaths (essentially a most holy sabbath), and was the holiest day of the year in which Israel's sins were removed for a year. The appointed time of Tabernacles began on the 15th day of the month, 5 days after the day of atonement, and was a time set apart for Israel to rest from their yearly labors. The first day of this festival was a sabbath, and the day following this festival was a sabbath; so it was bracketed by special sabbaths that were distinct from any weekly sabbaths that occurred during that time.
Genesis 7:11 states that Noah’s ark rested on the 17th day of the 7th month. This day falls within the 7-day festival of Tabernacles, which is the 7th festival (or appointed time) of YHWH. The number 7 always signifies rest from labor.
Additionally, the children of Israel were originally supposed to enter into rest in the promised land during the time of first ripe grapes. That harvest occurs in the fall of the year, as do the appointed times of the day of atonement and Tabernacles.
And Moses sent them to spy out the land of Canaan ... Now the time was the time of the first ripe grapes. Numbers 13:17-20
In other words, GOD's original plan for their entering into rest corresponded with these appointed times in the fall.
However, they did not enter in under Moses because of unbelief, and subsequently wandered in the desert for 40 years. Afterwards they entered the promised land under Joshua just before Passover in the first month of the year. But they did not enter into the true rest that GOD has planned for his people from the foundation of the world, as indicated in Hebrews 4:8:
For if Joshua had caused them to rest, he would not have spoken about another day after these things. Hebrews 4:8
This change of entering the promised land (which symbolizes rest) from the appointed times in the 7th month to the appointed time of Passover in the first month signifies GOD's postponement of his people's true rest until Christ, our Passover, could accomplish and establish the more excellent way that would allow GOD's people to forever enter into their final rest in the (as of yet) unfulfilled appointed times of YHWH.
So, IMO, the future fulfillments of these appointed times (what he calls another day) are what the writer of Hebrews is referring to in Hebrew 4:8-9. The example of disobedient Israelites not entering into rest in the promised land through unbelief warns us to always strive through faith to enter into Christ's rest, that culminates in the keeping of the sabbath of the fulfilled day of atonement and subsequent festival of Tabernacles, when those who do believe fully enter into GOD's promised eternal rest.
So let us strive daily to enter into this keeping of a sabbath that is left for GOD's people when Christ returns to give them rest.
Come to me, all of you who labor and are burdened, and I will give you rest. Take my yoke on you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. Matthew 11:28-29