Jeremiah 9:4-8

Let 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. Everyone deceives his neighbor, and no one speaks the truth; they have taught their tongue to speak lies; they weary themselves committing iniquity. Heaping oppression upon oppression, and deceit upon deceit, they refuse to know me, declares the LORD. Therefore thus says the LORD of hosts: “Behold, I will refine them and test them, for what else can I do, because of my people? Their 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.