If any one of you is invited to a meal when he is fasting, he should say:" I am fasting."
Sahih Muslim Book 13, Hadith 208
← Previous Hadith " Fasting for one month."

Sahih Muslim Book 13, Hadith 207 Next Hadith → When any one of you gets up in the morning in the state of fasting, he should neither use obscene language nor do any act of ignorance. And if anyone slanders him or quarrels with him, he should say:" I am fasting, I am fasting."

Sahih Muslim Book 13, Hadith 209