John 14:5
Thomas said to him, "Lord, we do not know where you are going, and how can we know the way?"
John 11:16
Then Thomas, who is called the Twin, said to his fellow disciples, "Let us also go, that we may die with him."
Mark 8:17-18
Being aware of it, Jesus said to them, "Why do you discuss the fact that you have no bread? Do you not yet perceive or understand? Are your hearts hardened?
Mark 9:19
He answered him, "O faithless generation, how long shall I be with you? How long shall I bear with you? Bring him to me."
Luke 24:25
And he said to them, "O foolish men, and slow of heart 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
So the other disciples told him, "We have seen the Lord." But he said to them, "Unless I see in his hands the print of the nails, and put my finger in the mark of the nails, and put my hand in his side, I will not believe."
Hebrews 5:11-12
About this we have much to say which is hard to explain, since you have become dull of hearing.