[632] Which is that form (rūpa) that is internal (ajjhattika) and is not the impermanence of form (rūpassa aniccatā)?
The eye sense base (cakkhāyatana) … the body sense base (kāyāyatana) — this is that form that is internal and is not the impermanence of form.
Which is that form that is external (bāhira) and is the impermanence of form?
That which is the destruction (khaya), the passing away (vaya), the breaking up (bheda), the disintegration (paribheda), the impermanence, the disappearance (antaradhāna) of form — this is that form that is external and is the impermanence of form.
Which is that form that is external and is not the impermanence of form?
The form sense base (rūpāyatana) … edible nutriment (kabaḷīkāra āhāra) — this is that form that is external and is not the impermanence of form.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.