Where it appears

• Acts 19:9But when some were hardened and disobedient, speaking evil of the Way before the multitude, he departed from them, and separated the disciples, reasoning daily in the school of Tyrannus.
• Rom 9:18So then, he has mercy on whom he desires, and he hardens whom he desires.
• Heb 3:8don’t harden your hearts, as in the rebellion, like as in the day of the trial in the wilderness,
• Heb 3:13but exhort one another day by day, so long as it is called “today”; lest any one of you be hardened by the deceitfulness of sin.
• Heb 3:15while it is said, “Today if you will hear his voice, don’t harden your hearts, as in the rebellion.”
• Heb 4:7he again defines a certain day, today, saying through David so long a time afterward (just as has been said), “Today if you will hear his voice, don’t harden your hearts.”