Take care, brethren, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. But exhort one another every day, as long as it is called "today," that none of you may be hardened by the deceitfulness of sin.
For we share in Christ, if only we hold our first confidence firm to the end, while it is said, "Today, when you hear his voice, do not harden your hearts as in the rebellion."
Who were they that heard and yet were rebellious? Was it not all those who left Egypt under the leadership of Moses? And with whom was he provoked forty years? Was it not with those who sinned, whose bodies fell in the wilderness? And to whom did he swear that they should never enter his rest, but to those who were disobedient? So we see that they were unable to enter because of unbelief.