(77) باب مَا يَقُولُ الصَّائِمُ إِذَا دُعِيَ إِلَى الطَّعَامِ
Abu Hurairah reported Messenger of Allah (ﷺ) as saying:
When one of you is invited (to a meal), and he is fasting, he should say that he is fasting.
Reference: Sunan Abi Dawud 2461
In-book reference: Book 14, Hadith 149
English translation: Book 13, Hadith 2455