Acts 7:51
O! stubborn race, heathen in heart and ears, you are for ever resisting the Holy Spirit; your ancestors did it, and you are doing it still.
Romans 2:5
Hard-hearted and impenitent as you are, you are storing up for yourself Wrath on the 'Day of Wrath,' when God's justice as a judge will be revealed;
Hebrews 3:13
Rather encourage one another daily--while there is a 'To-day'--to prevent any one among you from being hardened by the deceitfulness of Sin.
Hebrews 3:15
To use the words of Scripture-- 'If to-day you hear God's voice, harden not your hearts, as when Israel provoked me.'