The Long Āgama Sūtra 19.1-3

19.1

（一九）佛說長阿含第二分大會經第十五

(19) The Great Assembly Sūtra, the Fifteenth, in the Second Section of the Dīrghāgama Spoken by the Buddha

Thus I have heard: One time, the Buddha was staying at Kapilavastu in the country of the Śākyans. He was accompanied by a large assembly of five hundred monks, all of whom were arhats. Marvelous gods had also gathered from the ten directions to honor the Tathāgata and the saṅgha of monks.

19.2

如是我聞：

Thus have I heard:

19.3

一時，佛在釋翅提國迦維林中，與大比丘眾五百人俱，盡是羅漢，復有十方諸神妙天皆來集會，禮敬如來及比丘僧。

At one time, the Buddha was dwelling in the Shakya country, in the Kapilavastu grove, together with a great assembly of five hundred bhikṣus, all of whom were arhats. Furthermore, the wonderful devas of the ten directions all assembled there to pay homage and reverence to the Tathāgata and the saṅgha of bhikṣus.