Ecclesiastes 10:20 in the World English Bible
Don’t curse the king, no, not in your thoughts; and don’t curse the rich in your bedroom, for a bird of the sky may carry your voice, and that which has wings may tell the matter.
Context
19 A feast is made for laughter, and wine maketh merry: but money answereth all things.
20 Curse not the king, no not in thy thought; and curse not the rich in thy bedchamber: for a bird of the air shall carry the voice, and that which hath wings shall tell the matter.