Sekhiyakaṇḍa

Vinayapiṭaka · Parivāra · Vol. 8 · Section 431

[431] Out of disrespect (anādariya), one eating while biting off mouthfuls of food commits one offense (āpatti): 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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