John 14:5
Thomas said to him, Lord, we know not where you go, and how do we know the way?
John 11:16
Then Thomas, who is called The twin, said to the fellow disciples, Let us go also, that we may die with him.
Mark 8:17-18
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?
Mark 9:19
And he answered and said to them, O faithless and perverse generation! How long shall I be with you? How long shall I suffer you? Bring him to me.
Luke 24:25
And he said to them, O foolish men, and of a mind slow to believe all that the prophets have spoken.
John 15:12
This is my commandment, that you love one another as I have loved you.
John 20:25-28
Then the other disciples said to him, We have seen the Lord; but he said to them, Unless I see in his hands the impression of the nails, and put my finger in the impression of the nails, and put my hand in his side, I will not believe.
Hebrews 5:11-12
Concerning whom we have much to say, and that which is difficult to explain, because you have become dull of hearing.