Koṭṭhikaaniccasutta
Atha kho āyasmā mahākoṭṭhiko yena bhagavā tenupasaṅkami …pe… ekamantaṁ nisinno kho āyasmā koṭṭhiko bhagavantaṁ etadavoca: “sādhu me, bhante, bhagavā saṅkhittena dhammaṁ desetu, yamahaṁ bhagavato dhammaṁ sutvā eko vūpakaṭṭho appamatto ātāpī pahitatto vihareyyan”ti.
With Koṭṭhita on Impermanence
Then Venerable Mahākoṭṭhita went up to the Buddha … and asked him, “Sir, may the Buddha please teach me Dhamma in brief. When I’ve heard it, I’ll live alone, withdrawn, diligent, keen, and resolute.”