Dutiyaavijjāpahānasutta
Atha kho aññataro bhikkhu …pe… etadavoca: “atthi nu kho, bhante, eko dhammo yassa pahānā bhikkhuno avijjā pahīyati, vijjā uppajjatī”ti?
Giving Up Ignorance (2nd)
Then a mendicant went up to the Buddha … and asked him, “Sir, is there one thing such that by giving it up a mendicant gives up ignorance and gives rise to knowledge?”