Taught at the Kūṭāgārasālā in Vesāli. As long as the Licchavī sleep on wooden beds (kaliṅgara)¹ so long will they be able to protect themselves from their enemy, Ajātasattu. When they begin to sleep on soft couches they will suffer defeat. Thus it is also with monks and Māra. S.ii.267 f.
¹ In Burma, monks (and meditators) sleep on a simple plank bed with nothing more than a straw mat. Soft mattresses are not used. The original translation used by Malalasekera was “straw.” (ed.)