The three principal scriptures， which are different according to the lineage. （1） The three scriptures of the Lotus tradition 法华三部经. （2） The three scriptures of the Maitreya tradition 弥勒三部经. （3） The three scriptures of the Pure Land tradition 净土三部经. （4）The three scriptures of the Maha^vairocana tradition 大日三部经. （5） In Japan， the three state-protecting scriptures 镇护国家三部经.