Saṃyutta Nikāya 29
1. Nāgavagga
5. Tatiyauposathasutta
Sāvatthinidānaṃ. Ekamantaṃ nisinno kho so bhikkhu bhagavantaṃ etadavoca: “ko nu kho, bhante, hetu, ko paccayo, yena m’idhekacce saṃsedajā nāgā uposathaṃ upavasanti vossaṭṭhakāyā ca bhavantī”ti? (Sabbaṃ vitthāretabbaṃ.) “Ayaṃ kho, bhikkhu, hetu, ayaṃ paccayo, yena m’idhekacce saṃsedajā nāgā uposathaṃ upavasanti vossaṭṭhakāyā ca bhavantī”ti.
Pañcamaṃ.