[121] On one occasion the Blessed One was dwelling at Vesālī, in the Great Wood, in the Hall with the Peaked Roof. Then, in the evening, the Blessed One emerged from seclusion and approached the infirmary. The Blessed One saw a certain bhikkhu who was weak and sick; having seen him, he sat down on the seat that had been prepared. Having sat down, the Blessed One addressed the bhikkhus:
"Bhikkhus, when five dhammas do not desert any bhikkhu whatsoever who is weak and sick, this may be expected of him: before long, with the destruction of the taints (āsava), he will realize for himself with direct knowledge, in this very life, the taintless liberation of mind (cetovimutti) and liberation by wisdom (paññāvimutti), and having entered upon it, he will dwell therein. What five? Here, bhikkhus, a bhikkhu dwells contemplating unattractiveness in the body (asubhānupassī); he is one who perceives repulsiveness in food; one who perceives non-delight in the entire world; one who contemplates impermanence in all conditioned things (saṅkhārā); and the perception of death (maraṇasaññā) is well established within him. Bhikkhus, when these five dhammas do not desert any bhikkhu whatsoever who is weak and sick, this may be expected of him: before long, with the destruction of the taints … having realized it and entered upon it, he will dwell therein."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.