Theravāda Vinayapiṭaka
Monks’ rules and their analysis
Monks’ Training (Sekhiya) 21–22
… in Anāthapiṇḍika’s monastery. Now at that time the group of six monks, their arms akimbo, went (sat down) amidst the houses … “…
‘Not with arms akimbo will I go (sit down) amidst the houses,’ is a training to be observed.”
One should not go (sit down) amidst the houses with the arms akimbo. Whoever out of disrespect, having placed the arms akimbo on one side or on both, goes (sits down) amidst the houses, there is an offence of wrong-doing.
There is no offence … as in Bu-Sk.15, Bu-Sk.16 … if he is the first wrong-doer.