Nibbānasutta
Atha kho āyasmā ānando yenāyasmā sāriputto tenupasaṅkami; upasaṅkamitvā āyasmatā sāriputtena saddhiṁ sammodi. Sammodanīyaṁ kathaṁ sāraṇīyaṁ vītisāretvā ekamantaṁ nisīdi. Ekamantaṁ nisinno kho āyasmā ānando āyasmantaṁ sāriputtaṁ etadavoca: “ko nu kho, āvuso sāriputta, hetu ko paccayo, yena m’idhekacce sattā diṭṭheva dhamme na parinibbāyantī”ti?
Extinguishment
Then Venerable Ānanda went up to Venerable Sāriputta, and exchanged greetings with him. When the greetings and polite conversation were over, Ānanda sat down to one side, and said to Sāriputta: “What is the cause, Reverend Sāriputta, what is the reason why some sentient beings are not fully extinguished in this very life?”