'Heard' in the Bible

How then shall they call upon him in whom they have not believed? and how shall they believe on him of whom they have not heard? and how shall they hear without one who preaches?

But I say, Have they not heard? Yea, surely, Their voice has gone out into all the earth, and their words to the extremities of the habitable world.

but according as it is written, To whom there was nothing told concerning him, they shall see; and they that have not heard shall understand.