“Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.”
King James Version (KJV)
4:7 After so long a time - It was above four hundred years from the time of Moses and Joshua to David. As it was said before - St. Paul here refers to the text he had just cited.
Heb 4:7 Again, he limiteth a certain day. The thought is that there is a day of opportunity. If that day is passed by, the opportunity is gone. The word of the Lord is "To day if ye will hear his voice, harden not your hearts". Saying in David. In Ps 95:7.