rest in peace idiom         
 (表示对死者的祝愿)安息
said to express the hope that someone's spirit has found peace after death
  She was a decent and compassionate woman: may she rest in peace. 她生前为人正直、富有同情心:愿她安息。 
  (abbreviation RIP)(常刻于墓碑上)安息 
often written on a gravestone