Book of Hebrews Commentary Pt 4

6 It still remains that some will enter that rest, and those who formerly had the gospel preached to them did not go in, because of their disobedience. 7 Therefore God again set a certain day, calling it Today, when a long time later he spoke through David, as was said before: 

     “Today, if you hear his voice, 

     do not harden your hearts.”

Heb 4:6–7.