好事不出門，惡事傳千里 [－－－－门－恶－传－－]

Jyutping hou2 si6 bat1 ceot1 mun4 , ok3 si6 cyun4 cin1 lei5
Pinyin hǎo shì bù chū mén , è shì chuán qiān lǐ

Definitions (CC-CEDICT)
  1. lit. good deeds do not go beyond the door, evil deeds spread a thousand miles
  2. a good deed goes unnoticed, but scandal spreads fast (idiom)