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.
Romans 10:9
Surrounding context
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):
10:9 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.
10:10 For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation.