Jeremiah 9:7-9

Therefore this is what the LORD Almighty says: ‘See, I will refine and test them, for what else can I do because of the sin of my people? Their tongue is a deadly arrow; it speaks deceitfully. With their mouths they all speak cordially to their neighbours, but in their hearts they set traps for them. Should I not punish them for this?’ declares the LORD. ‘Should I not avenge myself on such a nation as this?’