Bhogajanavagga

Vinayapiṭaka · Parivāra · Vol. 8 · Section 321

[321] Eating food at a public rest house (āvasathapiṇḍa) beyond that [one allowance], a bhikkhu commits two offenses (āpatti): he accepts it, thinking, "I shall eat" — an offense of wrong-doing (dukkaṭa); for every mouthful swallowed — an offense of 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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 337 — Acelakavagga