作鹽作光 [－盐－－]

Jyutping zok3 jim4 zok3 gwong1
Pinyin zuò yán zuò guāng

Definitions (粵典–words.hk)
  1. 語句
    指以​身作則​、​服務​社會​；​通常​係​基督徒​用​嘅
    "to be salt and light"