Sahih Muslim 2702
صحيح مسلم#2702SahihAbu Huraira (Allah be pleased with him) reported Allah's Apostle (ﷺ) as saying:If any one of you is invited to a meal when he is fasting, he should say:" I am fasting
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 13:208