Jeremiah 9:4-8

4Everyone has to be on guard against his friend. Don’t trust any brother, for every brother will certainly deceive, and every friend spread slander.

5Each one betrays his friend; no one tells the truth. They have taught their tongues to speak lies; they wear themselves out doing wrong.

6You live in a world of deception. In their deception they refuse to know me. This is the Lord’s declaration.

7Therefore, this is what the Lord of Armies says: I am about to refine them and test them, for what else can I do because of my dear people?

8Their tongues are deadly arrows — they speak deception. With his mouth one speaks peaceably with his friend, but inwardly he sets up an ambush.