• Hebrews 3:7-13
  Therefore, as the Holy Spirit says:
  “ Today, if you will hear His voice,
  Do not harden your hearts as in the rebellion,
  In the day of trial in the wilderness,
  Where your fathers tested Me, tried Me,
  And saw My works forty years.
  Therefore I was angry with that generation,
  And said, ‘They always go astray in their heart,
  And they have not known My ways.’
  So I swore in My wrath,
  'They shall not enter My rest.'"
  Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God; but exhort one another daily, while it is called "Today," lest any of you be hardened through the deceitfulness of sin.
   
• Psalm 95:7-10
  For He is our God,
  And we are the people of His pasture,
  And the sheep of His hand. Today, if you will hear His voice:
  “Do not harden your hearts, as in the rebellion,
  As in the day of trial in the wilderness,
  When your fathers tested Me;
  They tried Me, though they saw My work.
  For forty years I was grieved with that generation,
  And said, ‘It is a people who go astray in their hearts,
  And they do not know My ways.’
  
   
• Matthew 19:7-9
  They said to Him, “Why then did Moses command to give a certificate of divorce, and to put her away?” He said to them, “Moses, because of the hardness of your hearts, permitted you to divorce your wives, but from the beginning it was not so. And I say to you, whoever divorces his wife, except for sexual immorality, and marries another, commits adultery; and whoever marries her who is divorced commits adultery.”
   

Related Scriptures

• Hebrews 4:2
  For indeed the gospel was preached to us as well as to them; but the word which they heard did not profit them, not being mixed with faith in those who heard it.
   
• Proverbs 4:23
  Keep your heart with all diligence,
  For out of it spring the issues of life.
  
   
• Jeremiah 17:9
  " The heart is deceitful above all things,
  And desperately wicked;
  Who can know it?
  
   
• Matthew 15:19
  For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies.
   
• Luke 8:15
  But the ones that fell on the good ground are those who, having heard the word with a noble and good heart, keep it and bear fruit with patience.
   
• Romans 1:28
  And even as they did not like to retain God in their knowledge, God gave them over to a debased mind, to do those things which are not fitting;
   
• Romans 8:7
  Because the carnal mind is enmity against God; for it is not subject to the law of God, nor indeed can be.
   
• Hebrews 3:17-19
  Now with whom was He angry forty years? Was it not with those who sinned, whose corpses fell in the wilderness? And to whom did He swear that they would not enter His rest, but to those who did not obey? So we see that they could not enter in because of unbelief.