Jeremiah 9:7-9

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. Shall I not punish them for these things? declares the LORD, and shall I not avenge myself on a nation such as this?