Sekhiyakaṇḍa

Vinayapiṭaka · Parivāra · Vol. 8 · Section 445

[445] Out of disrespect (anādariya), one teaching the Dhamma to a person with a knife in hand (satthapāṇi) commits one offence (āpatti): a dukkaṭa.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places