Theravāda Vinayapiṭaka
Monks’ rules and their analysis
Monks’ Training (Sekhiya) 60
… in Anāthapiṇḍika’s monastery. Now at that time the group of six monks taught dhamma to (someone) with a weapon in his hand … “…
“‘I will not teach dhamma to (someone) who has a weapon in his hand (and) who is not ill,’ is a training to be observed.”
Weapon means: a long-bow, a cross-bow. Dhamma should not be taught to (someone) who has a weapon in his hand (and) who is not ill … if he is the first wrong-doer.
The Sixth Division: that on hissing