Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:5658a –
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السيوطي:٥٦٥٨a –

"إِنَّ الصَّائِمَ إِذَا أُكلَ عِنْدَهُ لَمْ تَزَلْ تُصَلِّي عليه الملائِكَةُ حتَّى يَفْرغُ مِنْ طَعَامِه".  

ابن سعد، [حم] أحمد [ت] الترمذي حسن صحيح، [طب] الطبرانى في الكبير [هب] البيهقى في شعب الإيمان [ق] البيهقى في السنن عن أُم عمارة نَسِيبَةُ بنت كعب

See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:3255 – ʿAlī b. Ḥujr > Sharīk > Ḥabīb b. Zayd > Laylá

The Prophet said: "When those who are not fasting eat in the presence of the fasting person, the angels send Salat upon him." (Using translation from Tirmidhī 784)   

الكبرى للنسائي:٣٢٥٥ – أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ قَالَ أَخْبَرَنَا شَرِيكٌ عَنْ حَبِيبِ بْنِ زَيْدٍ عَنْ لَيْلَى

أَنَّ النَّبِيَّ ﷺ قَالَ «الصَّائِمُ إِذَا أُكِلَ عِنْدَهُ صَلَّتْ عَلَيْهِ الْمَلَائِكَةُ»  

suyuti:5657a –

The Prophet said: "When those who are not fasting eat in the presence of the fasting person, the angels send Salat upon him." (Using translation from Tirmidhī 784)   

السيوطي:٥٦٥٧a –

"إِنَّ الصَّائِمَ إذا أُكِلَ عِنْدَه صَلَّتْ عَلَيهِ الْمَلائَكَةُ ".  

[حب] ابن حبّان عن أُم عمارة بنت كعب