'Voice' in the Bible

But how are they to call on One in whom they have not believed? And how are they to believe in One whose voice they have never heard? And how are they to hear without a preacher?

But I ask, “Did they not hear?” Yes, they did:Their voice has gone out to all the earth,and their words to the ends of the inhabited world.

so that you may glorify the God and Father of our Lord Jesus Christ with a united mind and voice.