三部经
There are several groups: (1) The Amitbha group, also styled 净土三部, is 无量寿经, 观无量寿经 and 阿弥陀经. (2) The Vairocana group is 大日经, 金刚顶经 and 苏悉地经; also called 三部秘经. (3) The Lotus group is the 无量义经, 妙法莲经 and 观普贤菩萨行法经. (4) The Maitreya group is 观弥勤菩萨上生兜率天经, 弥勒下生经 and 弥勒大成佛经.
