Only here in the New Testament. Originally ἦθος means an accustomed seat or haunt; thence custom, usage; plural, manners, morals, character. The passage, “Evil company doth corrupt good manners,” is an iambic line; either the repetition of a current proverb, or a citation of the same proverb from the poet Menander. Compare Aeschylus: “Alas for the ill-luck in mortals that brings this honest man into company with those who have less regard for religion. In every matter, indeed, nothing is worse than evil-fellowship” (ὁμιλίας) (“Seven against Thebes,” 593-595).