John 14:5
Thomas said unto him, "Lord we know not whither thou goest. Also how is it possible for us to know the way?"
John 11:16
Then said Thomas, which is called Didymus, unto the disciples, "Let us also go, that we may die with him."
Mark 8:17-18
And when Jesus knew that, he said unto them, "Why take ye thought because ye have no bread? Perceive ye not yet, neither understand? Have ye your hearts yet blinded?
Mark 9:19
He answered him and said, "O generation without faith, how long shall I be with you? How long shall I suffer you? Bring him unto me."
Luke 24:25
And he said unto them, "O fools, and slow of heart to believe all that the prophets have spoken.
John 15:12
This is my commandment: that ye love together as I have loved you.
John 20:25-28
The other disciples said unto him, "We have seen the Lord." And he said unto them, "Except I see in his hands the print of the nails, and put my finger in the holes of the nails, and thrust my hand into his side, I will not believe."
Hebrews 5:11-12
Whereof we have many things to say which are hard to be uttered: because ye are dull of hearing.