Sirach 19:26

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

Sirach 19:26 In-Context

24 He that hath small understanding, and feareth God, is better than one that hath much wisdom, and transgresseth the law of the most High.
25 There is an exquisite subtilty, 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 hangeth down his head sadly; 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.

The Brenton translation of the Septuagint is in the public domain.