無功不受祿 [无－－－禄]

Jyutping mou4 gung1 bat1 sau6 luk6
Pinyin wú gōng bù shòu lù

Definitions (CC-CEDICT)
  1. Don't get a reward if it's not deserved. (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to refuse to accept an undeserved reward