Maggasutta
Sāvatthinidānaṁ. Tatra kho bhagavā bhikkhū āmantesi: “ekamidāhaṁ, bhikkhave, samayaṁ uruvelāyaṁ viharāmi najjā nerañjarāya tīre ajapālanigrodhe paṭhamābhisambuddho. Tassa mayhaṁ, bhikkhave, rahogatassa paṭisallīnassa evaṁ cetaso parivitakko udapādi: ‘ekāyanvāyaṁ maggo sattānaṁ visuddhiyā sokaparidevānaṁ samatikkamāya dukkhadomanassānaṁ atthaṅgamāya ñāyassa adhigamāya nibbānassa sacchikiriyāya, yadidaṁ—cattāro satipaṭṭhānā.
The Path
At Sāvatthī. There the Buddha addressed the mendicants: “Mendicants, this one time, when I was first awakened, I was staying in Uruvelā at the goatherd’s banyan tree on the bank of the Nerañjarā River. As I was in private retreat this thought came to mind: ‘The four kinds of mindfulness meditation are the path to convergence. 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.