大唐西域記 8.44

8.44

菩提樹西不遠，大精舍中，有鍮石佛像，飾以奇珍，東面而立。前有青石，奇文異采，是昔如來初成正覺，梵王起七寶堂，帝釋建七寶座，佛於其上七日思惟，放異光明，照菩提樹。去聖悠遠，寶變為石。

Not far to the west of the Bôdhi tree is a large vihâra in which is a figure of Buddha made of teou-shih (brass), ornamented with rare jewels; he stands with his face to the east. Before it is a blue stone with wonderful marks upon it and strangely figured. This is (the place where) Buddha sat on a seven-gemmed throne made by Sakra Dêva-râja when Brahma-râja built a hall for him of seven precious substances, after he had arrived at complete enlightenment. Whilst he thus sat for seven days in reflection, the mysterious glory which shone from his person lit up the Bôdhi tree. From the time of the holy one till the present is so long that the gems have changed into stone. Not far to the south of the Bôdhi tree is a stûpa about 100 feet high, which was built by Asôka-râja. Bôdhisattva having bathed in the Nairañjanâ river, proceeded towards the Bôdhi tree. Then he thought, "What shall I do for a seat? I will seek for some pure rushes when the day breaks." Then Sakra-râja (Shih) transformed himself into a grass-cutter, who, with his burden on his back, went along the road. Bôdhisattva addressing him said, "Can you give me the bundle of grass you are carrying on your back?" The assumed grass-cutter, hearing the request, offered the grass with respect. Bodhisattva having received it, went onwards to the tree.