The Tipiṭaka in Three Languages

Sekhiyakaṇḍa

Vinayapiṭaka · Parivāra · Vol. 8 · Section 447

[447] Out of disrespect (anādariya), one teaching the Dhamma to a person wearing wooden sandals (pādukā) commits one offense: an offense of wrong-doing (dukkaṭa).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places