John 14:5
Thomas said to him, "Lord, we do not know where you are going. How are we able to know the way?"
John 11:16
Then Thomas (the one who is called Didymus) said to his fellow disciples, "Let us go also, so that we may die with him."
Mark 8:17-18
And knowing [this], he said to them, "Why are you discussing that you have no bread? Do you not yet perceive or understand? Have your hearts been hardened?
Mark 9:19
And he answered them [and] said, "O unbelieving generation! {How long} will I be with you? {How long} must I put up with you? Bring him to me!"
Luke 24:25
And he said to them, "O foolish and slow in heart to believe in all that the prophets have spoken!
John 15:12
This is my commandment: that you love one another just as I have loved you.
John 20:25-28
So the other disciples said to him, "We have seen the Lord!" But he said to them, "Unless I see in his hands the mark of the nails, and put my finger into the mark of the nails, and put my hand into his side, I will never believe!"
Hebrews 5:11-12
Concerning this {we have much to say and it is difficult to explain}, since you have become sluggish in hearing.