he again defines a certain day, today, saying through David so long a time afterward (just as has been said), “Today if you will hear his voice, don’t harden your hearts.”
Again--Anew the promise recurs. Translate as the Greek order is, "He limited a certain day, 'To-day.'" Here Paul interrupts the quotation by, "In (the Psalm of) David saying after so long a time (after five hundred years' possession of Canaan)," and resumes it by, "as it has been said before (so the Greek oldest manuscript, before, namely, Heb 3:7, Heb 3:15), To-day if ye hear His voice," &c. [ALFORD].
7. But there is some more difficulty in what he immediately subjoins, that there is another today appointed for us in the Psalm, because the former people had been excluded; but the words of David (as it may be said) seem to express no such thing, and mean only this, that God punished the unbelief of the people by refusing to them the possession of the land.
Again he limiteth a certain day,.... Since the seventh day of the creation was a day of rest which God entered into, and not man; and since the land of Canaan was a typical rest, which the unbelieving Israelites did not enter into, because of unbelief; and yet there must be persons, and there must be a time for them to enter into the true...