Hebrews 4:9 (KJV)

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.

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.

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.