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((إِذَا دُعِيَ أَحَدُكُمْ فَلْيُجِبْ، فَإِنْ كَانَ صَائِماً فَلْيُصَلِّ، وَإِنْ كَانَ مُفْطِراً فَلْيَطْعَمْ)) ، وَمَعْنَى فَلْيُصَلِّ أَيْ فَلْيَدْعُ.
If you are not invited (to a meal) then answer. If you happen to be fasting, then supplicate (for those present) and if you are not fasting, then eat.
onceText: Hisn al-Muslim by Sa‘id ibn ‘Ali ibn Wahf al-Qahtani, via hisnmuslim.com.