Mark 6:52
for they understood not concerning the bread, for their heart was hardened.
Mark 3:5
And looking around on them in anger, being grieved at the hardness of their hearts, he said to the man, Stretch out your hand. And he stretched it out, and his hand was restored.
Mark 8:17-21
And Jesus knowing it, said to them, Why do you reason because you have no bread? Do you not yet perceive nor understand? Is your heart hardened?
Matthew 16:9-11
Do you not yet understand nor remember the five loaves of the five thousand, and how many travelling-baskets you took up?
Mark 7:18
And he said to them, Are you also so without understanding? Do you not understand that nothing which enters into a man from without can defile him,
Mark 16:14
And afterwards he appeared to the eleven, as they reclined, and reproached their unbelief and hardness of heart, because they believed not those who had seen him since he rose from the dead.
Luke 24:25
And he said to them, O foolish men, and of a mind slow to believe all that the prophets have spoken.
Romans 11:7
What then? What Israel seeks, this it did not obtain, but the election obtained; and the rest were hardened,??8 as it is written, God gave them a spirit of stupor, eyes that they should not see, and ears that they should not hear??o this day.