'Mouths' in the Bible

You shall say to them, ‘This is the nation that did not obey the voice of the Lord their God or accept correction and warning; truth and faithfulness have perished and have completely vanished from their mouths.

You have planted them, they have also taken root;They grow, they have even produced fruit.You are honored by their [hypocritical] lipsBut [You are] far from their heart and mind.

thus says the Lord of hosts, the God of Israel, as follows: ‘You and your wives have both declared with your mouth and fulfilled it with your hand, saying, “We will certainly perform our vows that we have vowed, to burn sacrifices to the queen of heaven (Ishtar) and to pour out drink offerings to her.” Surely then confirm your vows and go ahead and perform your vows! [If you intend to defy all My warnings, proceed!]’