鄭人買履 [郑－买－]

Jyutping zeng6 jan4 maai5 lei5
Pinyin zhèng rén mǎi lǚ

Definitions (Wiktionary)
  1. phrase, idiomatic
    a person who rigidly adheres to rules and regulations (or established convention), while at the same time ignoring the reality of a situation