佛說觀佛三昧海經 7.27

7.27

「爾時世尊坐龍王窟不移坐處，亦受王請入那乾訶城，耆闍崛山、舍衛國、迦毘羅城、及諸住處皆見有佛。時虛空中蓮華座上無量化佛，一切世界滿中化佛，龍王歡喜發大誓願：『願我來世得佛如此。』佛受王請經七日已，王遣一人乘八千里象，持諸供具遍一切國供養眾僧，到處皆見釋迦文佛。信反白王：『如來世尊！不但此國，餘國亦有！餘國諸佛皆說苦、空、無常、無我、六波羅蜜。』王聞是語，豁然意解得無生忍。

At that time, the Bhagavat sat in the dragon king's cave without shifting from his seat; yet he also accepted the king's invitation to enter the city of Nagarahāra. At Gṛdhrakūṭaparvata, in the country of Śrāvastī, at the city of Kapilavastu, and in all his dwelling places, a Buddha was seen. Boundless transformation Buddhas sat on lotus seats in the sky, and all worlds were filled with transformation Buddhas. The dragon king rejoiced and made a great vow: 'May I, in a future life, attain Buddhahood like this!'
After the Buddha had accepted the king's invitation for seven days, the king dispatched a man riding an elephant capable of traveling eight thousand li, carrying various offerings to make offerings to the saṅgha across all lands. Everywhere he went, he saw Śākyamuni Buddha. The messenger returned and reported to the king, 'The Tathāgata, the Bhagavat, is not only in this country—he is also in other countries! In other countries, all the Buddhas are preaching suffering, emptiness, impermanence, non-self, and the six pāramitās.'
When the king heard these words, his mind opened in sudden awakening and he attained the patience of the non-arising of dharmas.