1At Sāvatthī.

Seated to one side, that mendicant said to the Buddha:

“Sir, what is the cause, what is the reason why some moisture-born dragons keep the sabbath, having transformed their bodies?”

(All should be told in full.)

1Sāvatthinidānaṁ.

Ekamantaṁ nisinno kho so bhikkhu bhagavantaṁ etadavoca:

“ko nu kho, bhante, hetu, ko paccayo, yena m’idhekacce saṁsedajā nāgā uposathaṁ upavasanti vossaṭṭhakāyā ca bhavantī”ti?

(Sabbaṁ vitthāretabbaṁ.) “Ayaṁ kho, bhikkhu, hetu, ayaṁ paccayo, yena m’idhekacce saṁsedajā nāgā uposathaṁ upavasanti vossaṭṭhakāyā ca bhavantī”ti.

Pañcamaṁ.