金光明最勝王經疏 1.206

1.206

經　「并四方四佛，威神共加護，東方阿閦尊、南方寶相佛、西方無量壽、北方天鼓音。」

Sūtra: 'Together with the four buddhas of the four directions,
Who jointly protect it with spiritual power:
In the east, the Honoured Akṣobhya;
In the south, Ratnaketu Buddha;
In the west, Amitāyus;
In the north, Dundubhisvara.'