Visuddhimagga VIII-210

Ime hi dīghanāsikassa nāsāpuṭaṃ ghaṭṭentā pavattanti.

即（出入息）于长鼻者的鼻孔起触，[PTS 284]

Ñ(VIII,210): These in-breaths and out-breaths occur striking the tip of the nose in a long-nosed man [284]

Rassanāsikassa uttaroṭṭhaṃ.

于短鼻者的上唇（起触）。

Ñ: and the upper lip in a short-nosed man.

Tasmānena imaṃ nāma ṭhānaṃ ghaṭṭentīti nimittaṃ ṭhapetabbaṃ.

是故那比丘即以「（出入息）于此处触」而安置（其心）于相（即触处）。

Ñ: So he should fix the sign thus: 'This is the place where they strike'.

Imameva hi atthavasaṃ paṭicca vuttaṃ bhagavatā –

即以这种意义而考察，如世尊说：

Ñ: This was why the Blessed One said:

‘‘nāhaṃ, bhikkhave, muṭṭhasatissa asampajānassa ānāpānassatibhāvanaṃ vadāmī’’ti (ma. ni. 3.149; saṃ. ni. 5.992).

「诸比丘！我不说忘念及不正知之人是安般念的修习者」。

Ñ: 'Bhikkhus, I do not say of one who is forgetful, who is not fully aware, [that he practises] development of mindfulness of breathing' (M.iii,84).