[860] Setting at Sāvatthī (Sāvatthīnidānaṃ). Now at that time the group-of-six bhikkhus taught the Dhamma to a person with a weapon in his hand … "I will not teach the Dhamma to a person who is not ill who has a weapon in his hand" — thus the training is to be undertaken.
"Weapon (sattha)" means: an instrument for striking, whether single-edged or double-edged. The Dhamma is not to be taught to a person who is not ill who has a weapon in his hand. Whichever bhikkhu, out of disrespect, teaches the Dhamma to a person who is not ill who has a weapon in his hand, commits an offense of wrong-doing (dukkaṭa).
There is no offense (anāpatti): if it is unintentional; if it is done through lapse of mindfulness; for one who does not know; if [the listener] is ill; in emergencies; for one who is insane; for the first offender.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.