Acelakavagga

Vinayapiṭaka · Parivāra · Vol. 8 · Section 333

[333] A bhikkhu who, intruding, takes a seat in a family "with food" (sabhojana kula) commits two offenses (āpatti): while he is in the act of sitting down, there is an offense of wrong-doing (dukkaṭa) for the effort; when he has sat down, there is an offense entailing expiation (pācittiya).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 8 · Section 320 — Ovādavagga