經律異相 6.58

6.58

有龍王請佛常住其所。若不住者我發惡心無由得道。諸梵天王復慇懃勸請。願為一切眾生莫獨住此。龍以七寶殿奉上如來。佛言。不須但以羅剎石窟施我。佛攝神足獨入石室。自敷坐具跏趺而坐。時羅剎女及龍。為四大弟子及阿難。又造五石室。佛受那先訶城王及諸國請。處處見佛虛空華座滿中化佛。龍王歡喜發大誓願。願我來世得佛如此。佛受王請七日。攝於神足。從石窟出。與諸比丘遊履諸處。龍所隨從。後佛還國啼哭雨淚。白言。願勿捨我。世尊安慰云。當坐汝窟中經千五百歲。時諸龍王合掌請佛入窟。佛坐窟中作十八變。踊身入石。猶如明鏡。在於石內影現於外。遠望則見。近視則無。諸天百千供養佛影。影亦說法。石窟高一丈八尺。深二十四步。石色清白（出觀佛三昧經第六卷）。

A dragon king requested that the Buddha reside permanently at his abode, saying, "If you do not stay, I will give rise to evil thoughts and have no means to attain the path." The Brahmā kings also earnestly exhorted and requested, "We pray that for the sake of all sentient beings, you do not stay here alone." The dragon offered a seven-jeweled palace to the Tathāgata. The Buddha said, "There is no need; simply give me the rākṣasa's stone cave." The Buddha drew in his supernatural powers, entered the stone chamber alone, spread his own seat-mat, and sat cross-legged. At that time, a rākṣasī and the dragon also built five stone chambers for the four great disciples and Ānanda. The Buddha accepted the invitations of the king of the city of Nagarahāra and various countries; everywhere the Buddha was seen, with lotus seats in empty space filled with transformation Buddhas. The dragon king was delighted and made a great vow: "May I in a future life become a Buddha like this!" The Buddha accepted the king's invitation for seven days, withdrew his supernatural powers, emerged from the stone cave, and traveled to various places with the monks, accompanied by the dragon. Later, when the Buddha was returning to his country, [the dragon] wept and shed tears like rain, saying, "I pray that you do not abandon me." The Bhagavat consoled him, saying, "I shall sit in your cave for one thousand five hundred years." Then the dragon kings joined their palms and requested the Buddha to enter the cave. Sitting in the cave, the Buddha displayed eighteen transformations and leaped into the stone as into a bright mirror. He remained within the stone, his shadow appearing on the outside: seen from afar, but invisible up close. Hundreds of thousands of devas made offerings to the Buddha's shadow, and the shadow also preached the Dharma. The stone cave was one zhang and eight feet high, twenty-four paces deep, and the color of the stone was pure and white (from the sixth fascicle of the Sūtra on the Samādhi of Contemplating the Buddha).