Mishkat al-Masabih #1988
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن أم عمَارَة بنت كَعْب إِنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ دَخَلَ عَلَيْهَا فَدَعَتْ لَهُ بِطَعَامٍ فَقَالَ لَهَا: «كُلِي» . فَقَالَتْ: إِنِّي صَائِمَةٌ. فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ الصَّائِمَ إِذَا أُكِلَ عِنْدَهُ صَلَّتْ عَلَيْهِ الْمَلَائِكَةُ حَتَّى يَفْرَغُوا» . رَوَاهُ أَحْمَدُ وَالتِّرْمِذِيّ وَابْن مَاجَه والدارمي
Umm ‘Umara, daughter of Ka‘b, said that once when the Prophet visited her and she called for food for him, he told her that she must eat also; but when she replied that she was fasting he said, “When people eat beside one who is fasting the angels invoke blessings on him till they finish eating.”
Ahmad, Tirmidhi, Ibn Majah and Darimi transmitted it.
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About Mishkat al-Masabih
This hadith is #1988 from Mishkat al-Masabih, in the Book of Fasting.