Hebrews Chapter 4 Verse 5Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief:

While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.

For some, when they had heard, did provoke: howbeit not all that came out of Egypt by Moses.

But with whom was he grieved forty years? [was it] not with them that had sinned, whose carcases fell in the wilderness?

And to whom sware he that they should not enter into his rest, but to them that believed not?

So we see that they could not enter in because of unbelief.

Let us therefore fear, lest, a promise being left [us] of entering into his rest, any of you should seem to come short of it.

For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard [it].

For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.

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.

And in this [place] again, If they shall enter into my rest.

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.

For he that is entered into his rest, he also hath ceased from his own works, as God [did] from his.

Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.

For the word of God [is] quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and [is] a discerner of the thoughts and intents of the heart.

Neither is there any creature that is not manifest in his sight: but all things [are] naked and opened unto the eyes of him with whom we have to do.

Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast [our] profession.

For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as [we are, yet] without sin.

Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.

The Book of Hebrews, Chapter 4, Verse 5