Nāḷandasutta
Ekaṁ samayaṁ bhagavā nāḷandāyaṁ viharati pāvārikambavane. Atha kho, upāli gahapati, yena bhagavā tenupasaṅkami …pe… ekamantaṁ nisinno kho, upāli gahapati, bhagavantaṁ etadavoca: “ko nu kho, bhante, hetu, ko paccayo yena m’idhekacce sattā diṭṭheva dhamme no parinibbāyanti? Ko pana, bhante, hetu, ko paccayo yena m’idhekacce sattā diṭṭheva dhamme parinibbāyantī”ti? (Yathā purimasuttantaṁ, evaṁ vitthāretabbaṁ.) “Ayaṁ kho, gahapati, hetu ayaṁ paccayo yena m’idhekacce sattā diṭṭheva dhamme parinibbāyantī”ti.
At Nāḷandā
At one time the Buddha was staying near Nāḷandā in Pāvārika’s Mango Grove. Then the householder Upāli went up to the Buddha … and asked him, “What is the cause, sir, what is the reason why some sentient beings are not fully extinguished in this very life? What is the cause, sir, what is the reason why some sentient beings are fully extinguished in this very life?” … (Tell in full as in SN 35.124.)