From the Shijing (Book of Songs), 'Xiaoya: Qiao Yan' (《
诗经·
小雅·
巧言》):
巧言如簧,
颜之厚矣 — 'glib words like a reed-pipe, what a thick face'. The
簧 (huáng) is the vibrating reed of a wind instrument; the metaphor is that the speaker's tongue produces sweet-sounding music designed to deceive.