Romans 10:9-12, 14-21

because if thou shalt confess with thy mouth Jesus as Lord, and shalt believe in thy heart that God raised him from the dead, thou shalt be saved: for with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. For the scripture saith, Whosoever believeth on him shall not be put to shame. For there is no distinction between Jew and Greek: for the same Lord is Lord of all, and is rich unto all that call upon him

How then shall they call on him in whom they have not believed? and how shall they believe in him whom they have not heard? and how shall they hear without a preacher? and how shall they preach, except they be sent? even as it is written, How beautiful are the feet of them that bring glad tidings of good things! But they did not all hearken to the glad tidings. For Isaiah saith, Lord, who hath believed our report? So belief cometh of hearing, and hearing by the word of Christ. But I say, Did they not hear? Yea, verily, Their sound went out into all the earth, And their words unto the ends of the world. But I say, Did Israel not know? First Moses saith, I will provoke you to jealousy with that which is no nation, With a nation void of understanding will I anger you. And Isaiah is very bold, and saith, I was found of them that sought me not; I became manifest unto them that asked not of me. But as to Israel he saith, All the day long did I spread out my hands unto a disobedient and gainsaying people.