So this is where it is first said!

I finally found it!  The place where it first says "confess with your mouth…..and believe in your heart.".  Wouldn't you know it was written by Paul.  

As you may recall, this time through the NT I have been comparing what Jesus said about what we need to do to be saved vs. what the rest of the NT says.  What I have found interesting is that I can't find any place where Jesus said we had to verbalize anything.  With Jesus it seemed to be 100% a heart issue.

On the other hand here is the first place I have found where the "requirement" to verbalize is added.  Hmm.  Interesting.

Romans 10:5-13(NKJV)

For Moses writes about the righteousness which is of the law, “The man who does those things shall live by them.”  

But the righteousness of faith speaks in this way, “Do not say in your heart, ‘Who will ascend into heaven?’”  (that is, to bring Christ down from above) 

or, “‘Who will descend into the abyss?’”  (that is, to bring Christ up from the dead). 

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

For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation. 

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

For there is no distinction between Jew and Greek, for the same Lord over all is rich to all who call upon Him. 

For “whoever calls on the name of the Lord shall be saved.”