'Mouth' in the Bible

Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world may be held accountable to God.

But what does it say? "The word is near you, in your mouth and in your heart" (that is, the word of faith that we preach),

because if you 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 and thus has righteousness and with the mouth one confesses and thus has salvation.