If a fasting person is invited to eat and he does not want to break his fast, or someone insults him or argues with him, it is recommended for him to say: "I am Fasting", and he should protect his fast from obscene speech, ignorance and the like Sahih Muslim 1150

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Translation

Abu 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."

If a fasting person is invited to eat and he does not want to break his fast, or someone insults him or argues with him, it is recommended for him to say: "I am Fasting", and he should protect his fast from obscene speech, ignorance and the like — Sahih Muslim 1150