Romans 2:5
But after thy hardness and impenitent heart treasurest up to thyself wrath in the day of wrath, and revelation, and righteous judgment of God?
Hebrews 3:8-9
if ye will hear his voice, harden not your hearts, as in the provocation, in the day of temptation in the wilderness,
Hebrews 3:13
But exhort one another daily, while it is called to day, lest any of you be hardened through the deceitfulness of sin:
Hebrews 3:15-19
we hold fast the beginning of our confidence firm to the end) While it is said; To-day, if ye will hear his voice, harden not your hearts, as in the provocation.
Hebrews 12:25
for if they escaped not who refused him that delivered the oracle on earth, much more shall not we, who turn away from him that speaketh from heaven:
Jude 1:5
I am therefore willing to remind you, who once knew this, that the Lord, having saved the people out of the land of Egypt, afterward destroyed them that believed not.
Acts 19:9
But when some were hardened, and would not believe, but spake reproachfully of the way before the multitude, he departed from them, and separated the disciples, discoursing daily in the school of one Tyrannus.