Hebrews 4:6-9

Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief: 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. For if Jesus had given them rest, then would he not afterward have spoken of another day. There remaineth therefore a rest to the people of God.