Tatiyasamudayadhammasutta
Ekaṁ samayaṁ āyasmā ca sāriputto āyasmā ca mahākoṭṭhiko bārāṇasiyaṁ viharanti isipatane migadāye …pe… ekamantaṁ nisinno kho āyasmā mahākoṭṭhiko āyasmantaṁ sāriputtaṁ etadavoca: “‘vijjā, vijjā’ti, āvuso sāriputta, vuccati. Katamā nu kho, āvuso, vijjā; kittāvatā ca vijjāgato hotī”ti?
Liable to Originate (3rd)
At one time Venerable Sāriputta and Venerable Mahākoṭṭhita were staying near Varanasi in the deer park at Isipatana. … Mahākoṭṭhita said to Sāriputta: “Reverend Sāriputta, they speak of this thing called ‘knowledge’. What is knowledge? And how is a knowing one defined?”