حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا دُعِيَ أَحَدُكُمْ إِلَى طَعَامٍ وَهُوَ صَائِمٌ فَلْيَقُلْ إِنِّي صَائِمٌ " .
Abu Hurairah reported Messenger of Allah (PBUH) as saying: When one of you is invited (to a meal), and he is fasting, he should say that he is fasting. Translation Not Available
Book Ref: Sunan Abi Dawud Book 14 Hadith 2461
Web Ref: Sunan Abi Dawud Book 13 Hadith 2455