Jami at-Tirmidhi 780
Jami at-Tirmidhi · Book 8: The Book on Fasting · What Has Been Related About The Fasting Person Accepting The Invitation (To A Meal)
Abu Hurairah narrated that:
حَدَّثَنَا أَزْهَرُ بْنُ مَرْوَانَ الْبَصْرِيُّ ، حَدَّثَنَا مُحَمَّدُ بْنُ سَوَاءٍ ، حَدَّثَنَا سَعِيدُ بْنُ أَبِي عَرُوبَةَ ، عَنْ أَيُّوبَ ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا دُعِيَ أَحَدُكُمْ إِلَى طَعَامٍ فَلْيُجِبْ فَإِنْ كَانَ صَائِمًا فَلْيُصَلِّ " . يَعْنِي الدُّعَاءَ .
The Prophet said: "When one of you is invited to eat then let him respond, if he is fasting then let him pray." Meaning: supplicate.
Grade: Sahih (Darussalam)