Jeremiah 9:6-8

New Revised Standard Version Catholic Edition

⁷ Therefore thus says the Lord of hosts:
I will now refine and test them,
    for what else can I do with my sinful people?^[b]
8 Their tongue is a deadly arrow;
    it speaks deceit through the mouth.
They all speak friendly words to their neighbors,
    but inwardly are planning to lay an ambush.