Kaṭhinavagga

Vinayapiṭaka · Parivāra · Vol. 8 · Section 262

[262] A bhikkhu dwelling apart from the three robes (ticīvara) for one night commits one offence (āpatti): a nissaggiya pācittiya (an offence entailing forfeiture and expiation).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.