Abu Hurairah (May Allah be pleased with him) reported:
Messenger of Allah ﷺ said, "When any of you is invited to a meal, he should accept the invitation. If he is observing Saum (fasting), he should supplicate for the betterment of the host and if he is not fasting, he should eat."

[Muslim].

عن أبى هريرة رضى الله عنه قال: قال رسول الله ﷺ : "إذا دعي أحدكم ، فليجب، فإن كان صائما فليصل، وإن كان مفطراً فليطعم" .