حَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ، أَخْبَرَنَا سُفْيَانُ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَنْ دُعِيَ فَلْيُجِبْ فَإِنْ شَاءَ طَعِمَ وَإِنْ شَاءَ تَرَكَ ‏"‏ ‏.‏

Jabir reported the Messenger of Allah(PBUH) as sayings: 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. Translation Not Available

Book reference: Sunan Abi Dawud Book 28 Hadith 3740
Web reference: Sunan Abi Dawud Book 27 Hadith 3731