Hebrews 3:15
It was said, To-day if you will hear his voice, harden not your hearts as in the provocation;
Hebrews 3:7-8
Wherefore, as the Holy Spirit says, To-day if you will hear his voice,
Hebrews 10:29
of how much greater punishment do you suppose he will be thought worthy, who has trodden down the Son of God, and accounted defiled the blood of the covenant with which he was purified, and treated injuriously the Spirit of grace.
Hebrews 10:38
but my righteous one shall live by faith, and if he draws back my soul takes no pleasure in him.
Treasury of Scripture Knowledge
Summary
While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.