Hebrews 3:7-19 - A Serious Warning Against Unbelief
7 Wherefore, as the Holy Ghost saith, To day if ye will hear his voice, 8 harden not your hearts, as in that bitter provocation, at the day of the temptation in the wilderness; 9 when your fathers tempted me, proved me, and saw my works during forty years. 10 Wherefore I was provoked against that generation, and said, They are always deluded in heart, and they have not known my ways: 11 so I swore in my wrath that they shall not enter into my rest.
12 Take heed, brethren, that there be not in any one of you a wicked heart of infidelity, [evident] in departure from the living God: 13 but exhort one another daily, whilst to-day remains, that no one of you be hardened by the deceitfulness of sin. 14 For we are partakers with Christ, if we hold the beginning of our confidence firm unto the end; 15 while it is said, To-day if ye will hear his voice, harden not your hearts as in the provocation.
16 For some, though they had heard, provoked him; yet not all who came out of Egypt by Moses. 17 But against whom was he incensed forty years? Was it not against those who had sinned, whose corpses fell in the wilderness? 18 And to whom did he swear that they should not enter into his rest, but to those who did not believe? 19 So we see that they could not enter in because of unbelief.