Romans 2:5
But by thy hardness and impenitence of heart thou art treasuring up to thyself wrath against the day of wrath and revelation of the just judgement of God,
Hebrews 3:8-9
harden not your hearts, as in the provocation, in the day of temptation in the wilderness, when your fathers tempted me,
Hebrews 3:13
but exhort one another daily, while it is called to-day; that none of you may be hardened through the deceitfulness of sin:
Hebrews 3:15-19
"To-day if ye will hear his voice,
Hebrews 12:25
See that ye reject not Him that speaketh; for if they escaped not, who rejected him that gave forth divine oracles on earth, much less shall we, if we turn away from Him that speaketh from heaven:
Jude 1:5
But I would remind you of this, which ye know already, that though the Lord saved the people out of the land of Egypt, yet He afterwards destroyed those that believed not:
Acts 19:9
But as some were hardened and refractory, speaking evil of the way of life before the multitude, he departed from them, and took away the disciples with him, disputing daily in the school of one Tyrannus.