Sirach 19:25-27

New Revised Standard Version, Anglicised

²⁵ There is a cleverness that is exact but unjust,
    and there are people who abuse favours to gain a verdict.
²⁶ There is the villain bowed down in mourning,
but inwardly he is full of deceit.
²⁷ He hides his face and pretends not to hear,
    but when no one notices, he will take advantage of you.