Saṁyutta Nikāya 54.4 1.

First Fruit Discourse

Ekadhammavagga Paṭhamaphalasutta “Ānāpānassati, bhikkhave, bhāvitā bahulīkatā mahapphalā hoti mahānisaṁsā.

Mindfulness of breathing when developed and cultivated, is of great fruit and great benefit.

Kathaṁ bhāvitā ca, bhikkhave, ānāpānassati kathaṁ bahulīkatā mahapphalā hoti mahānisaṁsā?

And how is mindfulness of breathing developed and cultivated so that it is of great fruit and great benefit?

Idha, bhikkhave, bhikkhu araññagato vā rukkhamūlagato vā suññāgāragato vā nisīdati pallaṅkaṁ ābhujitvā ujuṁ kāyaṁ paṇidhāya parimukhaṁ satiṁ upaṭṭhapetvā.

Here a disciple goes to the forest, to the root of a tree, or to an empty hut, sits down, crosses his legs, holds his body erect, and establishes mindfulness on itself.

So satova assasati, satova passasati …pe…

He breathes in mindfully, he breathes out mindfully...

‘paṭinissaggānupassī assasissāmī’ti sikkhati, ‘paṭinissaggānupassī passasissāmī’ti sikkhati.

He trains thus: I shall breathe in contemplating relinquishment; he trains thus: I shall breathe out contemplating relinquishment.

Evaṁ bhāvitā kho, bhikkhave, ānāpānassati evaṁ bahulīkatā mahapphalā hoti mahānisaṁsā.

Thus developed thus cultivated, mindfulness of breathing is of great fruit and great benefit.

Evaṁ bhāvitāya kho, bhikkhave, ānāpānassatiyā evaṁ bahulīkatāya dvinnaṁ phalānaṁ aññataraṁ phalaṁ pāṭikaṅkhaṁ— diṭṭheva dhamme aññā, sati vā upādisese anāgāmitā”ti. Catutthaṁ.

When mindfulness of breathing is thus developed and cultivated, one of two fruits is to be expected: either final knowing here and now, or if there is a trace of clinging left, non-returning.