薰蕕不同器 [－莸－－－]

Jyutping fan1 jau4 bat1 tung4 hei3
Pinyin xūn yóu bù tóng qì

Definitions (CC-CEDICT)
  1. lit. fragrant herbs and foul herbs do not go into the same vessel (idiom)
  2. bad people and good people do not mix