Jeremiah 9:4-8

4Let everyone beware of his neighbor, and put no trust in any brother, for every brother is a deceiver, and every neighbor goes about as a slanderer.

5Everyone deceives his neighbor, and no one speaks the truth; they have taught their tongue to speak lies; they weary themselves committing iniquity.

6Heaping oppression upon oppression, and deceit upon deceit, they refuse to know me, declares the Lord.

7Therefore thus says the Lord of hosts: "Behold, I will refine them and test them, for what else can I do, because of my people?

8Their tongue is a deadly arrow; it speaks deceitfully; with his mouth each speaks peace to his neighbor, but in his heart he plans an ambush for him.