Romans 10:8

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,'

But what does the righteousness which is of faith say? It says that ‘the word is near you, in your mouth and in your heart', this word referring to ‘the word of faith' (the word that produces faith) preached by the Apostles, and by Paul's lieutenants. It is saying that it is readily to hand and easily available, affecting both mouth and heart, for it is receivable through faith. And the content of that word is now made clear in Romans 10:9. The fact that it is ‘in your mouth and in your heart' explains the next verse and why Paul speaks of confessing with the mouth and believing in the heart, for the content of that word is Jesus as LORD, and the resurrection.