4 Bible Verses about Incredulity

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

behold, I am laying a fleece of wool on the threshing floor; if there is dew on the fleece alone, and it is dry on all the ground, then I shall know that thou wilt deliver Israel by my hand, as thou hast said." And it was so. When he rose early next morning and squeezed the fleece, he wrung enough dew from the fleece to fill a bowl with water. Then Gideon said to God, "Let not thy anger burn against me, let me speak but this once; pray, let me make trial only this once with the fleece; pray, let it be dry only on the fleece, and on all the ground let there be dew."read more.
And God did so that night; for it was dry on the fleece only, and on all the ground there was dew.

They bring him who was before blind to the Pharisees. Now it was sabbath when Jesus made the mud and opened his eyes. The Pharisees therefore also again asked him how he received his sight. And he said to them, He put mud upon mine eyes, and I washed, and I see.read more.
Some of the Pharisees therefore said, This man is not of God, for he does not keep the sabbath. Others said, How can a sinful man perform such signs? And there was a division among them. They say therefore again to the blind man, What dost thou say of him, that he has opened thine eyes? And he said, He is a prophet. The Jews therefore did not believe concerning him that he was blind and had received sight, until they had called the parents of him that had received sight. And they asked them saying, This is your son, of whom ye say that he was born blind: how then does he now see? His parents answered them and said, We know that this is our son, and that he was born blind; but how he now sees we do not know, or who has opened his eyes we do not know. He is of age: ask him; he will speak concerning himself. His parents said these things because they feared the Jews, for the Jews had already agreed that if any one confessed him to be the Christ, he should be excommunicated from the synagogue. On this account his parents said, He is of age: ask him. They called therefore a second time the man who had been blind, and said to him, Give glory to God: we know that this man is sinful. He answered therefore, If he is sinful I know not. One thing I know, that, being blind before, now I see. And they said to him again, What did he do to thee? how opened he thine eyes? He answered them, I told you already and ye did not hear: why do ye desire to hear again? do ye also wish to become his disciples? They railed at him, and said, Thou art his disciple, but we are disciples of Moses. We know that God spoke to Moses; but as to this man, we know not whence he is. The man answered and said to them, Now in this is a wonderful thing, that ye do not know whence he is, and he has opened mine eyes. But we know that God does not hear sinners; but if any one be God-fearing and do his will, him he hears. Since time was, it has not been heard that any one opened the eyes of one born blind. If this man were not of God he would be able to do nothing. They answered and said to him, Thou hast been wholly born in sins, and thou teachest us? And they cast him out. Jesus heard that they had cast him out, and having found him, he said to him, Thou, dost thou believe on the Son of God? He answered and said, And who is he, Lord, that I may believe on him? And Jesus said to him, Thou hast both seen him, and he that speaks with thee is he. And he said, I believe, Lord: and he did him homage. And Jesus said, For judgment am I come into this world, that they which see not may see, and they which see may become blind. And some of the Pharisees who were with him heard these things, and they said to him, Are we blind also? Jesus said to them, If ye were blind ye would not have sin; but now ye say, We see, your sin remains.

But we beg to hear of thee what thou thinkest, for as concerning this sect it is known to us that it is everywhere spoken against. And having appointed him a day many came to him to the lodging, to whom he expounded, testifying of the kingdom of God, and persuading them concerning Jesus, both from the law of Moses and the prophets, from early morning to evening. And some were persuaded of the things which were said, but some disbelieved.read more.
And being disagreed among themselves they left; Paul having spoken one word, Well spoke the Holy Spirit through Esaias the prophet to our fathers, saying, Go to this people, and say, Hearing ye shall hear and not understand, and seeing ye shall see and not perceive. For the heart of this people has become fat, and they hear heavily with their ears, and they have closed their eyes; lest they should see with their eyes, and hear with their ears, and understand with their heart, and be converted, and I should heal them. Be it known to you therefore, that this salvation of God has been sent to the nations; they also will hear it. And he having said this, the Jews went away, having great reasoning among themselves.