Hadith 185
Hisn al-Muslim
Fortress of the Muslim (Hisn al-Muslim) · By one fasting when presented with food and does not break his fast
Arabic
(إِذَا دُعِيَ أَحَدُكُمْ فَلْيُجِبْ، فَإِنْ كَانَ صَائِماً فَلْيُصَلِّ، وَإِنْ كَانَ مُفْطِراً فَلْيَطْعَمْ) ، وَمَعْنَى فَلْيُصَلِّ أَيْ فَلْيَدْعُ.
English translation
-- When you are invited (to eat) then reply to the invitation. If you are fasting then invoke Allah's blessings (on your host), and if you are not fasting then eat. Reference: Muslim 2/1054.