Mark 6:52
For they had not understood about the loaves, their minds being slow to learn.
Mark 3:5
As they remained silent, Jesus looked round at them in anger, grieving at the hardness of their hearts, and said to the man: "Stretch out your hand." The man stretched it out; and his hand had become sound.
Mark 8:17-21
And, noticing this, Jesus said to them: "Why are you talking about your being short of bread? Do not you yet see or understand? Are your minds still so slow or comprehension?
Matthew 16:9-11
Do not you yet see, nor remember the five loaves for the five thousand, and how many baskets you took away?
Mark 7:18
"What, do even you understand so little?" exclaimed Jesus. "Do not you see that there is nothing external to a man, which by going into a man, can 'defile' him,
Mark 16:14
Later on, he made himself known to the Eleven themselves as they were at a meal, and reproached them with their want of faith and their stubbornness, because they did not believe those who had seen him after he had risen from the dead.
Luke 24:25
Then Jesus said to them: "O foolish men, slow to accept all that the Prophets have said!
Romans 11:7
What follows from this? Why, that Israel as a nation failed to secure what it was seeking, while those whom God selected did secure it.