Romans 10:11

But what does it say? “The word is near you, in your mouth and in your heart;” that is, the word of faith which we preach:

that if you will confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved.

For with the heart one believes resulting in righteousness; and with the mouth confession is made resulting in salvation.

For there is no distinction between Jew and Greek; for the same Lord is Lord of all, and is rich to all who call on him.

For, “Whoever will call on the name of the Lord will be saved.”

How then will they call on him in whom they have not believed? How will they believe in him whom they have not heard? How will they hear without a preacher?