Ben Sira 19:27

27 casting down his countenance and making as if he heard not; where he is not known, he will do thee a mischief before thou be aware.

Ben Sira 19:27 In-Context

25 here is an exquisite subtlety, and the same is unjust; and there is one that turneth aside to make judgment appear, and there is a wise man that justifieth in judgment.

26 There is a wicked man that sadly hangeth down his head, but inwardly he is full of deceit,

27 casting down his countenance and making as if he heard not; where he is not known, he will do thee a mischief before thou be aware.

28 And if for want of power he be hindered from sinning, yet when he findeth opportunity he will do evil.

29 A man may be known by his look, and one that hath understanding by his countenance when thou meetest him.