[640] "Whoever" means: whoever, of whatever sort … .
"Bhikkhu" means: … . This is the "bhikkhu" intended in this sense.
"Knows" means: either he knows by himself, or others inform him, or that one [the offender] informs him.
"According to the rule (yathādhammaṃ)" means: what has been carried out in accordance with the Dhamma, in accordance with the Vinaya, in accordance with the Teacher's instruction — this is called "according to the rule."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.