Mahākaccānasutta
Tatra kho āyasmā mahākaccāno bhikkhū āmantesi: “āvuso bhikkhave”ti. “Āvuso”ti kho te bhikkhū āyasmato mahākaccānassa paccassosuṁ. Āyasmā mahākaccāno etadavoca: “acchariyaṁ, āvuso; abbhutaṁ, āvuso. Yāvañcidaṁ tena bhagavatā jānatā passatā arahatā sammāsambuddhena sambādhe okāsādhigamo anubuddho sattānaṁ visuddhiyā sokaparidevānaṁ samatikkamāya dukkhadomanassānaṁ atthaṅgamāya ñāyassa adhigamāya nibbānassa sacchikiriyāya, yadidaṁ cha anussatiṭṭhānāni.
With Mahākaccāna
There Mahākaccāna addressed the mendicants: “Reverends, mendicants!” “Reverend,” they replied. Venerable Mahākaccāna said this: “It’s incredible, reverends, it’s amazing! How this Blessed One who knows and sees, the perfected one, the fully awakened Buddha, has found an opening amid confinement; that is, the six topics for recollection. They are in order to purify sentient beings, to get past sorrow and crying, to make an end of pain and sadness, to discover the system, and to realize extinguishment.