1 Peter 3:15
but sanctify the Lord God in your hearts, and be ready always to respond to every man that asks you a reason of the hope that is in you with meekness and reverence,
Jesus answered and said unto him, Because I said unto thee, I saw thee under the fig tree, believest thou? thou shalt see greater things than these.
Jesus said unto him, Thomas, because thou hast seen me, thou hast believed; blessed are those that have not seen and yet have believed.
and said unto the woman, Now we believe, not because of thy speech; for we have heard him ourselves and know that this is indeed the Christ, the Saviour of the world.
They said therefore unto him, What sign showest thou then that we may see and believe thee? what dost thou work?
He saved others; he cannot save himself. If he is the King of Israel, let him now come down from the cross , and we will believe him.
Let the Christ, King of Israel, descend now from the stake that we may see and believe. And those that were crucified with him reviled him.
1 Corinthians 15:2
by which also ye are being saved if ye retain the word that I preached unto you, unless ye have believed in vain.