Ibn Umar (Allah be pleased with them) reported Allah's Apostle (ﷺ) having said:When you are invited to a feast (even though it is) the leg of the sheep, you should accept it.
وَحَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى، أَخْبَرَنَا ابْنُ وَهْبٍ، حَدَّثَنِي عُمَرُ بْنُ مُحَمَّدٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " إِذَا دُعِيتُمْ إِلَى كُرَاعٍ فَأَجِيبُوا " .
Muslim
The Book of Marriage • Hadith 120