Romans 3:14; Romans 3:19; Romans 10:8-10; Romans 15:6

Romans 3:14

14 Whose mouth is full of cursing and bitterness:

Romans 3:19

19 Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God.

Romans 10:8-10

8 But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;

9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.

10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.

Romans 15:6

6 That ye may with one mind and one mouth glorify God, even the Father of our Lord Jesus Christ.