The Tipiṭaka in Three Languages

Sekhiyakaṇḍa

Vinayapiṭaka · Parivāra · Vol. 8 · Section 454

[454] Out of disrespect (anādariya), a bhikkhu who, having sat down on the ground, teaches the Dhamma to a person seated on a seat, falls into one offence: an offence 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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