佛口蛇心 [－－－－]

Jyutping fat6 hau2 se4 sam1
Pinyin fó kǒu shé xīn

Definitions (CC-CEDICT)
  1. words of a Buddha, heart of a snake (idiom); two-faced
  2. malicious and duplicitous
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to speak with benevolence and mercy but be vicious and malicious in reality
    (syn.) 人面獸心, 人面兽心