4 Bible Verses about Incredulity

But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.

behold, I will put a fleece of wool on the threshing-floor; if there be dew on the fleece only, and it be dry upon all the ground, then shall I know that thou wilt save Israel by my hand, as thou hast spoken. And it was so; for he rose up early on the morrow, and pressed the fleece together, and wrung the dew out of the fleece, a bowlful of water. And Gideon said unto God, Let not thine anger be kindled against me, and I will speak but this once: let me make trial, I pray thee, but this once with the fleece; let it now be dry only upon the fleece, and upon all the ground let there be dew.read more.
And God did so that night: for it was dry upon the fleece only, and there was dew on all the ground.

They bring to the Pharisees him that aforetime was blind. Now it was the sabbath on the day when Jesus made the clay, and opened his eyes. Again therefore the Pharisees also asked him how he received his sight. And he said unto them, He put clay upon mine eyes, and I washed, and I see.read more.
Some therefore of the Pharisees said, This man is not from God, because he keepeth not the sabbath. But others said, How can a man that is a sinner do such signs? And there was division among them. They say therefore unto the blind man again, What sayest thou of him, in that he opened thine eyes? And he said, He is a prophet. The Jews therefore did not believe concerning him, that he had been blind, and had received his sight, until they called the parents of him that had received his sight, and asked them, saying, Is this your son, who ye say was born blind? How then doth he now see? His parents answered and said, We know that this is our son, and that he was born blind: but how he now seeth, we know not; or who opened his eyes, we know not: ask him; he is of age; he shall speak for himself. These things said his parents, because they feared the Jews: for the Jews had agreed already, that if any man should confess him to be Christ, he should be put out of the synagogue. Therefore said his parents, He is of age; ask him. So they called a second time the man that was blind, and said unto him, Give glory to God: we know that this man is a sinner. He therefore answered, Whether he is a sinner, I know not: one thing I know, that, whereas I was blind, now I see. They said therefore unto him, What did he to thee? How opened he thine eyes? He answered them, I told you even now, and ye did not hear; wherefore would ye hear it again? would ye also become his disciples? And they reviled him, and said, Thou art his disciple; but we are disciples of Moses. We know that God hath spoken unto Moses: but as for this man, we know not whence he is. The man answered and said unto them, Why, herein is the marvel, that ye know not whence he is, and yet he opened mine eyes. We know that God heareth not sinners: but if any man be a worshipper of God, and do his will, him he heareth. Since the world began it was never heard that any one opened the eyes of a man born blind. If this man were not from God, he could do nothing. They answered and said unto him, Thou wast altogether born in sins, and dost thou teach us? And they cast him out. Jesus heard that they had cast him out; and finding him, he said, Dost thou believe on the Son of God? He answered and said, And who is he, Lord, that I may believe on him? Jesus said unto him, Thou hast both seen him, and he it is that speaketh with thee. And he said, Lord, I believe. And he worshipped him. And Jesus said, For judgment came I into this world, that they that see not may see; and that they that see may become blind. Those of the Pharisees who were with him heard these things, and said unto him, Are we also blind? Jesus said unto them, If ye were blind, ye would have no sin: but now ye say, We see: your sin remaineth.

But we desire to hear of thee what thou thinkest: for as concerning this sect, it is known to us that everywhere it is spoken against. And when they had appointed him a day, they came to him into his lodging in great number; to whom he expounded the matter, testifying the kingdom of God, and persuading them concerning Jesus, both from the law of Moses and from the prophets, from morning till evening. And some believed the things which were spoken, and some disbelieved.read more.
And when they agreed not among themselves, they departed after that Paul had spoken one word, Well spake the Holy Spirit through Isaiah the prophet unto your fathers, saying, Go thou unto this people, and say, By hearing ye shall hear, and shall in no wise understand; And seeing ye shall see, and shall in no wise perceive: For this people's heart is waxed gross, And their ears are dull of hearing, And their eyes they have closed; Lest, haply they should perceive with their eyes, And hear with their ears, And understand with their heart, And should turn again, And I should heal them. Be it known therefore unto you, that this salvation of God is sent unto the Gentiles: they will also hear. And when he had said these words, the Jews departed, having much disputing among themselves.