1 Peter 3:15
But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asks you a reason of the hope that is in you with meekness and fear:
Jesus answered and said unto him, Because I said unto you, I saw you under the fig tree, do you believe? You shall see greater things than these.
Jesus said unto him, Thomas, because you have seen me, you have believed: blessed are they that have not seen, and yet have believed.
And said unto the woman, Now we believe, not because of your saying: for we have heard him ourselves, and know that this is indeed the Christ, the Savior of the world.
They said therefore unto him, What sign do you show then, that we may see, and believe you? what do you work?
He saved others; himself he cannot save. If he be the King of Israel, let him now come down from the cross, and we will believe him.
Let Christ the King of Israel descend now from the cross, that we may see and believe. And they that were crucified with him reviled him.
1 Corinthians 15:2
By which also you are saved, if you keep in memory what I preached unto you, unless you have believed in vain.