And in this place again - Psalm 95:11.
If they shall enter - That is, they shall not enter; see the notes at Hebrews 3:11. The object of quoting this here seems to be two-fold:
(1) To show that even in this Psalm God spoke of "his" rest, and said that they should not enter into it; and,
(2) it is connected with Hebrews 4:6, and is designed to show that it was implied that a rest yet remained. "That which deserves to be called "the divine rest" is spoken of in the Scriptures, and as "they" did not enter into it, it follows that it must be in reserve for some others, and that the promise must still remain."

And in this place again - In the ninety-fifth Psalm, already quoted, Psalm 95:3. This was a second rest which the Lord promised to the believing, obedient seed of Abraham; and as it was spoken of in the days of David, when the Jews actually possessed this long promised Canaan, therefore it is evident that that was not the rest which God intended, as the next verse shows.

And in this place again,.... In Psalm 95:11 he speaks again of another rest distinct from that on the seventh day; which, and not the latter, is what believers under the Gospel dispensation enter into:
if they shall enter into my rest: that is, unbelievers shall not enter into it; as the unbelieving Israelites did not enter into the typical rest, so neither shall any unbeliever enter into the Gospel rest, the antitype of the former.

in this place--In this passage of the Psalm again, it is implied that the rest was even then still future.

In this psalm, of a rest yet to come.