Romans 10:10-14

for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation.

For the Scripture says, “Whoever believes in Him will not be put to shame.”

For there is no distinction between Jew and Greek; for the same Lord is Lord of all, abounding in riches for all who call on Him;

for “Everyone who calls on the name of the Lord will be saved.”

How then are they to call on Him in whom they have not believed? How are they to believe in Him whom they have not heard? And how are they to hear without a preacher?