Mark 6:52
for they understood not through the loaves: for their heart was hardened.
Mark 3:5
And looking round upon them with anger, distressed at the hardening of their heart, he says to the man, Stretch out thy hand. And he stretched it out, and his hand was restored.
Mark 8:17-21
And Jesus knowing it, says to them, Why reason ye because ye have no bread? Do ye not yet perceive nor understand? Have ye your heart yet hardened?
Isaiah 63:17
Why, O Jehovah, hast thou made us to err from thy ways, hast hardened our heart from thy fear? Return for thy servants' sake, the tribes of thine inheritance.
Matthew 16:9-11
Do ye not yet understand nor remember the five loaves of the five thousand, and how many hand-baskets ye took up?
Mark 7:18
And he says to them, Are ye also thus unintelligent? Do ye not perceive that all that is outside entering into the man cannot defile him,
Mark 16:14
Afterwards as they lay at table he was manifested to the eleven, and reproached them with their unbelief and hardness of heart, because they had not believed those who had seen him risen.
Luke 24:25
And he said to them, O senseless and slow of heart to believe in all that the prophets have spoken!
Romans 11:7
What is it then? What Israel seeks for, that he has not obtained; but the election has obtained, and the rest have been blinded,