Mark 6:52
For it was not clear to them about the bread; but their hearts were hard.
Mark 3:5
And looking round on them he was angry, being sad because of their hard hearts; and he said to the man, Put out your hand. And he put it out, and his hand was made well.
Mark 8:17-21
And Jesus, hearing it, said to them, Why are you reasoning among yourselves because you have no bread? do you still not see, and is it still not clear to you? are your hearts so hard?
Isaiah 63:17
O Lord, why do you send us wandering from your ways, making our hearts hard, so that we have no fear of you? Come back, because of your servants, the tribes of your heritage.
Matthew 16:9-11
Do you still not see, or keep in mind the five cakes of bread of the five thousand, and the number of baskets you took up?
Mark 7:18
And he said to them, Have even you so little wisdom? Do you not see that whatever goes into a man from outside is not able to make him unclean,
Mark 16:14
And later he was seen by the eleven themselves while they were taking food; and he said sharp words to them because they had no faith and their hearts were hard, and because they had no belief in those who had seen him after he had come back from the dead.
Luke 24:25
And he said, O foolish men! how slow you are to give belief to what the prophets have said.
Romans 11:7
What then? That which Israel was searching for he did not get, but those of the selection got it and the rest were made hard.