Hebrews 3:15
while it is said, "To-day, if ye hear His voice, harden not your hearts as in the provocation."
Hebrews 3:7-8
Wherefore, as the Holy Spirit saith, "To-day, if ye hear His voice,
Hebrews 10:29
of how much worse punishment, think ye, shall he be accounted worthy, who trampled under foot the Son of God, and accounted the blood of the covenant with which He was sanctified an unholy thing, and treated with contempt the Spirit of grace?
Hebrews 10:38
"But My righteous one shall live by faith, and, if he draw back, My soul has 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.