Hadith 8:90
Narrated [Abu Hurairah (RA)]:
Allah's Messenger (ﷺ), "When one of you is invited (to a meal) he must accept. If he is fasting he should pray (i.e. make supplication for the host) and if he is not fasting he should eat." [Muslim reported it too].
وَعَنْهُ قَالَ : قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ إِذَا دُعِيَ أَحَدُكُمْ فَلْيُجِبْ ; فَإِنْ كَانَ صَائِمًا فَلْيُصَلِّ , وَإِنْ كَانَ مُفْطِرًا فَلْيُطْعَمْ } أَخْرَجَهُ مُسْلِمٌ أَيْضًا