Mark 8:17
And as He noticed it He said to them, "Why are you discussing the fact that you have no bread? Do you not yet know nor understand? Are your minds so dull?
Mark 6:52
for they did not understand the lesson of the loaves; their minds were dull.
Matthew 15:17
Do you not understand that whatever goes into the mouth passes into the stomach and afterwards into the waste?
Matthew 16:8-9
Jesus knew it and said, "Why are you discussing among yourselves the fact that you have no bread? Have you so little faith?
Mark 2:8
Now Jesus at once felt in His spirit that they were arguing about this, and said, "Why are you arguing to yourselves about this?
Mark 3:5
So Jesus looked around at them in anger, because He was pained over their stubbornness of mind, and said to the man, "Hold out your hand." And he held it out, and his hand was cured.
Mark 16:14
Later on He appeared to the Eleven themselves while they were at table, and reproved them for their lack of faith and their stubbornness, because they had not believed those who had seen Him after He had been raised from the dead.
Luke 24:25
Then He said to them, "O men sluggish in mind and slow in heart to believe all that the prophets have said!
John 2:24-25
But He would not trust Himself to them, because He knew all men
John 16:30
Now we know that you know everything and do not need that anyone should ask you questions. For this reason we believe that you have come from God."
John 21:17
For the third time Jesus asked him, "Simon, son of John, do you really tenderly love me?" Peter was hurt because Jesus the third time asked him, "Do you really tenderly love me?" So he answered Him, "Lord, you know everything; you know that I do tenderly love you." Jesus said to him, "Then feed my sheep.
Hebrews 4:12-13
For God's message is alive and full of power in action, sharper than any double-edged sword, piercing even to the depths of soul and spirit, to the dividing of joints and marrow, and passing judgment on the thoughts and purposes of the heart.
Hebrews 5:11-12
I have much to say to you about Him, but it is difficult to make it clear to you, since you have become so dull in your spiritual senses.
Revelation 2:23
and I will surely strike her children dead. So all the churches will know that I am He who searches men's inmost hearts, and that I will repay each of you for exactly what you have done.