Sāvatthinidānaṁ.
At Sāvatthi.
“Asaṅkhatañca vo, bhikkhave, desessāmi asaṅkhatagāmiñca maggaṁ. Taṁ suṇātha.
“Bhikkhus, I will teach you the unconditioned and the path leading to the unconditioned. Listen to this.
Katamañca, bhikkhave, asaṅkhataṁ? Yo, bhikkhave, rāgakkhayo dosakkhayo mohakkhayo—idaṁ vuccati, bhikkhave, asaṅkhataṁ.
And what, bhikkhus, is the unconditioned? The wearing away of passion, the wearing away of aversion, the wearing away of delusion — this is called the unconditioned.
Katamo ca, bhikkhave, asaṅkhatagāmimaggo? Kāyagatāsati. Ayaṁ vuccati, bhikkhave, asaṅkhatagāmimaggo.
And what, bhikkhus, is the path leading to the unconditioned? Mindfulness directed to the body[1]. This is called the path leading to the unconditioned.
Iti kho, bhikkhave, desitaṁ vo mayā asaṅkhataṁ, desito asaṅkhatagāmimaggo. Yaṁ, bhikkhave, satthārā karaṇīyaṁ sāvakānaṁ hitesinā anukampakena anukampaṁ upādāya, kataṁ vo taṁ mayā. Etāni, bhikkhave, rukkhamūlāni, etāni suññāgārāni. Jhāyatha, bhikkhave, mā pamādattha; mā pacchā vippaṭisārino ahuvattha. Ayaṁ vo amhākaṁ anusāsanī”ti.
Thus, bhikkhus, I have taught you the unconditioned and the path leading to the unconditioned. What a teacher should do out of compassion for his disciples, seeking their welfare, I have done for you, bhikkhus. Here are the roots of the trees, here are the empty huts. Meditate, bhikkhus, do not be negligent; lest you later regret it. This is our instruction to you.”
See MN 10 ¶6 - ¶50 for all the practices comprised under kāyagatāsati - mindfulness directed to the body.