1 Peter 3:15
but sanctify the Lord the Christ in your hearts, and be always prepared to give an answer to every one that asks you to give an account of the hope that is in you, but with meekness and fear;
Jesus answered and said to him, Because I said to thee, I saw thee under the fig-tree, believest thou? Thou shalt see greater things than these.
Jesus says to him, Because thou hast seen me thou hast believed: blessed they who have not seen and have believed.
and they said to the woman, It is no longer on account of thy saying that we believe, for we have heard him ourselves, and we know that this is indeed the Saviour of the world.
They said therefore to him, What sign then doest thou that we may see and believe thee? what dost thou work?
He saved others, himself he cannot save. He is King of Israel: let him descend now from the cross, and we will believe on him.
Let the Christ the King of Israel descend now from the cross, that we may see and may believe. And they that were crucified with him reproached him.
1 Corinthians 15:2
by which also ye are saved, (if ye hold fast the word which I announced to you as the glad tidings,) unless indeed ye have believed in vain.