一言千金

yīyánqiānjīn
  1. one word worth a thousand in gold (idiom); valuable advice
  2. words of enormous weight

CEDICT

形容说话很有价值。

重編國語辭典

Entry Composition

1 一言 yīyán
  1. one sentence
  2. brief remark
2 千金 qiānjīn
  1. thousand jin 斤 (pounds) of gold
  2. money and riches
  3. (honorific) invaluable (support)
  4. (honorific) daughter