7 Therefore, as the Holy Spirit says,
‘Today, if you hear his voice,
⁸ do not harden your hearts as in the rebellion,
   as on the day of testing in the wilderness,
⁹ where your ancestors put me to the test,
   though they had seen my works ¹⁰for forty years.
Therefore I was angry with that generation,
and I said, “They always go astray in their hearts,
   and they have not known my ways.”
¹¹ As in my anger I swore,
   “They will not enter my rest.” ’
¹²Take care, brothers and sisters, that none of you may have an evil, unbelieving heart that turns away from the living God. ¹³But exhort one another every day, as long as it is called ‘today’, so that none of you may be hardened by the deceitfulness of sin. ¹⁴For we have become partners of Christ, if only we hold our first confidence firm to the end. ¹⁵As it is said,
‘Today, if you hear his voice,
do not harden your hearts as in the rebellion.’
¹⁶Now who were they who heard and yet were rebellious? Was it not all those who left Egypt under the leadership of Moses? ¹⁷But with whom was he angry for forty years? Was it not those who sinned, whose bodies fell in the wilderness? ¹⁸And to whom did he swear that they would not enter his rest, if not to those who were disobedient? ¹⁹So we see that they were unable to enter because of unbelief.