Hebrews 3:8
harden not your hearts, as in the provocation, in the day of temptation in the wilderness,
Matthew 13:15
for the heart of this people was made gross, and with their ears they heard heavily, and their eyes they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and turn, and I should heal them.'
Acts 19:9
But, when some were hardening themselves and were disbelieving, speaking evil of the Way before the multitude, he, withdrawing from them, separated the disciples; reasoning daily in the school of Tyrannus.
Romans 2:5-6
but, after your hardness and impenitent heart, you are treasuring up for yourself wrath in the day of wrath and of the revelation of the righteous judgment of God,
1 Corinthians 10:9
Nor let us tempt the Lord, as some of them tempted Him, and perished by the serpents.
Hebrews 3:12-13
Take heed, brethren, lest at any time there shall be in anyone of you an evil heart of unbelief, in falling away from the living God;