Since, then, it remains for some to enter His rest, and since those who formerly heard the good news did not enter because of their disobedience,
Here, I. The apostle declares that our privileges by Christ under the gospel are not only as great, but greater than those enjoyed under the Mosaic law. He specifies this, that we have a promise left us of entering into his rest; that is, of entering into a covenant-relation to Christ, and a state of communion with God through Christ, and of growing up therein...
Commenting on Hebrews 4:1-10
it remaineth--still to be realized. some must enter--The denial of entrance to unbelievers is a virtual promise of entrance to those that believe. God wishes not His rest to be empty, but furnished with guests (Luk 14:23). they to whom it was first preached entered not--literally, "they who first (in the time of Moses) had the Gospel preached to them," namely, in type, see on Heb 4:2.
Verse 6. Seeing therefore it remaineth that some must enter therein. That is, "Since there is a rest spoken of in the Scriptures, implying that it is to be enjoyed by some, and since they to whom it was first promised did not inherit it, it follows that it must still be in reserve." This is the conclusion which the apostle draws from the argument...