Theravāda Vinayapiṭaka
Monks’ rules and their analysis
Monks’ Training (Sekhiya) 3–4
… in Anāthapiṇḍika’s monastery. Now at that time the group of six monks, having uncovered their bodies, went amidst the houses instead of went read, in Bu-Sk.4, sat down
‘Properly clad will I go (sit down) amidst the houses,’ is a training to be observed.”
One should go (sit down) amidst the houses properly clad. Whoever out of disrespect, having uncovered the body, goes (sits down) amidst the houses, there is an offence of wrong-doing.
There is no offence if it is unintentional, if he is not thinking, if he does not know, if he is ill in Bu-Sk.4 it is added here: if he has gone into residence for the rains, if there are accidents, if he is mad, if he is the first wrong-doer.