when one of you is invited to a meal, he must accept. If he wishes he may eat, but if he wishes(to leave), he may leave. (Using translation from Abū Dāʾūd 3740)
قَالَ رَسُولُ اللهِ ﷺ إِذَا دُعِيَ أَحَدُكُمْ فَلْيُجِبْ فَإِنْ شَاءَ طَعِمَ وَإِنْ شَاءَ تَرَكَ