[876] Origin at Sāvatthī. Now at that time the bhikkhus (bhikkhu) of the group of six defecated and also urinated while standing. … "I will not, when not ill, defecate or urinate while standing" — thus a training is to be undertaken.
Defecation or urination should not be done by a bhikkhu while standing when he is not ill. Whoever, out of disrespect, being not ill, defecates or urinates while standing, incurs an offense of wrong-doing (dukkaṭa).
There is no offense (anāpatti): if it is unintentional; if done from absence of mindfulness (sati); if he does not know; if he is ill; in emergencies; if he is mad; if he is the first offender (ādikammika).
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.