'Believed' in the Bible

For what? if some have not believed, shall their unbelief make the faith of God of none effect?

For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.

(As it is written, I have made thee a father of many nations,) before him whom he believed, even God, who quickeneth the dead, and calleth those things which be not as though they were.

Who against hope believed in hope, that he might become the father of many nations; according to that which was spoken, So shall thy seed be.

For with the heart is believed to righteousness; and with the mouth confession made to salvation.

How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?

But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report?

For as ye in times past have not believed God, yet have now obtained mercy through their unbelief:

Even so have these also now not believed, that through your mercy they also may obtain mercy.

And that, knowing the time, that now it is high time to awake out of sleep: for now is our salvation nearer than when we believed.