'Mouth' in the Bible

"whose mouth is full of cursing and bitterness."

Now we know that whatever things the law says, it speaks to those who are under the law, that every mouth may be closed, and all the world may be brought under the judgment of God.

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 will 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 unto righteousness; and with the mouth confession is made unto salvation.

that with one accord you may with one mouth glorify the God and Father of our Lord Jesus Christ.