عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ إِذَا دُعِيَ أَحَدُكُمْ إِلَى الدَّعْوَةِ فَلْيُجِبْ أَوْ قَالَ فَلْيَأْتِهَا قَالَ وَكَانَ ابْنُ عُمَرَ يُجِيبُ صَائِمًا وَمُفْطِرًا
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: When someone is invited, he should accept it. Or he said: He should attend the invitation. Sayyiduna Ibn Umar (may Allah be pleased with them both) would accept every invitation, whether he was fasting or not.