Hebrews 4:1; Hebrews 4:6-8

1 Therefore, since a promise remains of entering His rest, let us fear lest any of you seem to have come short of it.
6 Since therefore it remains that some must enter it, and those to whom it was first preached did not enter because of disobedience, 7 again He designates a certain day, saying in David, "Today," after such a long time, as it has been said: "Today, if you will hear His voice, Do not harden your hearts." 8 For if Joshua had given them rest, then He would not afterward have spoken of another day.