noun
three main sutras (of a school of Buddhism)
Refers to the three foundational sutras of a particular Buddhist school, such as the Pure Land school's three sutras.
浄土宗の三部経は、無量寿経、観無量寿経、阿弥陀経です。
The three main sutras of the Pure Land school are the Larger Sutra, the Contemplation Sutra, and the Amida Sutra.