Romans 2:5
But according to your hardness and unchanged heart you treasure up wrath for yourself in the day of wrath and of a revelation of the righteous judgment of God,
Hebrews 3:8-9
harden not your hearts as in the provocation, in the day of the trial in the wilderness,
Hebrews 3:13
but exhort one another daily, while it is called to-day, that no one of you may be hardened by the deception of sin;
Hebrews 3:15-19
It was said, To-day if you will hear his voice, harden not your hearts as in the provocation;
Hebrews 12:25
See that you refuse not him that speaks; for if they did not escape who refused him that gave answers on earth, much more shall we [not escape] who turn ourselves away from him in heaven;
Jude 1:5
But I wish to remind you, though you once knew all, that the Lord having saved his people from Egypt, afterwards destroyed those that believed not,
Acts 19:9
But when some were hardened and believed not, speaking evil of the way before the multitude, he left them and separated the disciples from them, and reasoned day by day in the school of one Tyrannus.