Mark 6:52
For they understood not the miracle of the loaves: for their hearts were hardened.
Mark 3:5
And when he had looked around at them with anger, being grieved for the hardness of their hearts, he said unto the man, Stretch forth your hand. And he stretched it out: and his hand was restored whole as the other.
Mark 8:17-21
And when Jesus knew it, he said unto them, Why reason you, because you have no bread? perceive you not yet, neither understand? have you your heart yet hardened?
Isaiah 63:17
O LORD, why have you made us to err from your ways, and hardened our heart from your fear? Return for your servants' sake, the tribes of your inheritance.
Matthew 16:9-11
Do you not yet understand, neither remember the five loaves of the five thousand, and how many baskets you took up?
Mark 7:18
And he said unto them, Are you so without understanding also? Do you not perceive, that whatsoever thing from outside enters into the man, it cannot defile him;
Mark 16:14
Afterward he appeared unto the eleven as they sat at table, and rebuked them for their unbelief and hardness of heart, because they believed not them who had seen him after he was risen.
Luke 24:25
Then he said unto them, O foolish ones, and slow of heart to believe all that the prophets have spoken:
Romans 11:7
What then? Israel has not obtained that which it seeks for; but the election has obtained it, and the rest were blinded