Mark 6:52
for they understood not concerning the loaves, but their heart was hardened.
Mark 3:5
And when he had looked round about on them with anger, being grieved at the hardening of their heart, he saith unto the man, Stretch forth thy hand. And he stretched it forth; and his hand was restored.
Mark 8:17-21
And Jesus perceiving it saith unto them, Why reason ye, because ye have no bread? do ye not yet perceive, neither understand? have ye your heart hardened?
Isaiah 63:17
O Jehovah, why dost thou make us to err from thy ways, and hardenest our heart from thy fear? Return for thy servants'sake, the tribes of thine inheritance.
Matthew 16:9-11
Do ye not yet perceive, neither remember the five loaves of the five thousand, and how many baskets ye took up?
Mark 7:18
And he saith unto them, Are ye so without understanding also? Perceive ye not, that whatsoever from without goeth into the man, it cannot defile him;
Mark 16:14
And afterward he was manifested unto the eleven themselves as they sat at meat; and he upbraided them with their unbelief and hardness of heart, because they believed not them that had seen him after he was risen.
Luke 24:25
And he said unto them, O foolish men, and slow of heart to believe in all that the prophets have spoken!
Romans 11:7
What then? that which Israel seeketh for, that he obtained not; but the election obtained it, and the rest were hardened: