Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
102. Chapter: On what someone says when food is brought when he is fasting and he does not break his fast
738. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "When one of you is invited he should respond to the invitation. If he is fasting, he should make a supplication, and if he is not fasting, he should eat." [Muslim]
