The command to accept invitations
حَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " إِذَا دُعِيَ أَحَدُكُمْ إِلَى وَلِيمَةِ عُرْسٍ فَلْيُجِبْ " .
Ibn Umar (Allah be pleased withthem) reported Allah's Messenger (ﷺ) having said this: When any one of you is invited to a wedding feast, he should accept that.