Kāyagatāsatisutta
Sāvatthinidānaṁ. “Asaṅkhatañca vo, bhikkhave, desessāmi asaṅkhatagāmiñca maggaṁ. Taṁ suṇātha. Katamañca, bhikkhave, asaṅkhataṁ? Yo, bhikkhave, rāgakkhayo dosakkhayo mohakkhayo— idaṁ vuccati, bhikkhave, asaṅkhataṁ. Katamo ca, bhikkhave, asaṅkhatagāmimaggo? Kāyagatāsati. Ayaṁ vuccati, bhikkhave, asaṅkhatagāmimaggo.
Mindfulness of the Body
At Sāvatthī. “Mendicants, I will teach you the unconditioned and the path that leads to the unconditioned. Listen … And what is the unconditioned? The ending of greed, hate, and delusion. This is called the unconditioned. And what is the path that leads to the unconditioned? Mindfulness of the body. This is called the path that leads to the unconditioned.