17 But with whom was he grieved forty years? was it not with them that had sinned, whose carcasses fell in the wilderness?
18 And to whom sware he that they should not enter into his rest, but to them that believed not?
19 So we see that they could not enter in because of unbelief.
Hebrews 4 Intro: The rest of saints attained by faith -- The power of God's word -- Our high priest, Jesus, the Son of God.
1 Let us therefore fear, lest, a promise being left us by entering into his rest, any of you should seem to come short of it.
2 For unto us was the rest preached, as well as unto them; but the word preached did not profit them, not being mixed with faith in them that heard it.
3 For we who have believed do enter into rest, as he said, As I have sworn in my wrath, If they harden their hearts they shall not enter into my rest; also, I have sworn, If they will not harden their hearts, they shall enter into my rest; although the works of God were prepared, (or finished,) from the foundation of the world.
4 For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works.
5 And in this place again, If they harden not their hearts they shall enter into my rest.
6 Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief;
7 Again, he limiteth a certain day, saying in David, Today, after so long a time; as it is said, Today if ye will hear his voice, harden not your hearts.
