Heb 4:11 does not use the term "Christ's rest". You are redefining the text to make it seem to mean something you want it to mean
You’re right to call that out—Hebrews 4:11 does
not literally say “Christ’s rest.” The Greek is:
Σπουδάσωμεν οὖν εἰσελθεῖν εἰς ἐκείνην τὴν κατάπαυσιν “Let us therefore be diligent to enter into
that rest.”
It does
not say: “Let us therefore be diligent to keep the seventh day.”
The only explicit “seventh day” phrase is in v.4, quoting Genesis, to show
how God rested. The command in v.11 is to enter
God’s κατάπαυσις, which the chapter has already distinguished from:
The wilderness generation’s failure (3:18–19; 4:6)
Joshua’s Canaan rest (4:8)
And by implication, any merely temporal “day” that does not fulfill the promised “another day.”
So when I said “Christ’s rest,” I was summarizing the
theological referent of “God’s rest” in Hebrews—God’s own rest, now offered in the Son (cf. Heb 1:1–3; 3:6, 14), not inserting a new phrase into the Greek.
Verses 4-10 shows the text is talking about the 7th day sabbath:
Heb 4:4 "For he spake in a certain place of the seventh
day on this wise, And God did rest the seventh day from all his works."
Which day is it talking about? Every day? If God had rested EVERY DAY then He would not have worked the other 6 days. This world would not exist.
Heb 4:10 "For he that is entered into his rest, he also hath ceased from his own works, as God
did from his."
God's people follow His example and rest on the 7th day from our 6-day work week, just as God did on the first week of creation.
This puts a whole different light on verse 11 than you wish to consider.
Verse 11 is a direct command to labor (endeavor with all our strength/might) to enter into the 7th day sabbath rest.
If you don't you will fall into unbelief.
Unbelief in the Creator.
Hebrews 4:4 absolutely identifies the seventh day—no dispute.
But the writer uses that seventh day as the prototype of God’s own
κατάπαυσις (rest), not as the object of the command in v.11.
The flow of vv.4–10 is not “the seventh day = the rest we must enter,” but “God’s seventh‑day rest = the pattern of the rest God still offers.”
Verse 8 is the key that breaks your chain: “If Joshua had given them rest, then would he not afterward have spoken of another day.” That “another day” is explicitly not the seventh day of creation, because that day was already known.
Verse 9 says a
σαββατισμός remains, but v.10 defines it: “he that is entered into His rest has ceased from his own works, as God did from His.”
The comparison is mode, not calendar—the believer ceases from works the way God ceased, not on the day God ceased.
Then v.11 commands diligence to enter that rest (
εἰς ἐκείνην τὴν κατάπαυσιν), the same rest of vv.3, 5, 10—God’s rest, not “the seventh day.”
Your reading makes v.8 meaningless (because the seventh day was already known and Joshua never changed it), collapses v.10’s “ceasing from works” into “ceasing from labor one day a week,” and forces v.11 to command a calendar when the Greek commands entry into God’s rest.
The text is about God’s rest, patterned on the seventh day, not a renewed seventh‑day command.
This is scripture, to deny it is to deny the work God has done and the rest he speaks of in Christ.