The Prophet said: "When those who are not fasting eat in the presence of the fasting person, the angels send Salat upon him."  

عَنِ النَّبِيِّ ﷺ قَالَ الصَّائِمُ إِذَا أَكَلَ عِنْدَهُ الْمَفَاطِيرُ صَلَّتْ عَلَيْهِ الْمَلاَئِكَةُ  

"I heard a freed slave of ours called Laila narrated from [his (Habib's) grandmother] Umm Amarah bint Ka'b Al-Ansar, that the Prophet entered upon her and some food was brought to him. He said: 'Eat.' She said: 'I am fasting.' So the Messenger of Allah said: 'Indeed the angels send Salat upon the fasting person when (others) eat in his presence, until they finish.' And perhaps he said: 'Until they have eaten their fill.'"  

أَنَّ النَّبِيَّ ﷺ دَخَلَ عَلَيْهَا فَقَدَّمَتْ إِلَيْهِ طَعَامًا فَقَالَ كُلِي فَقَالَتْ إِنِّي صَائِمَةٌ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّ الصَّائِمَ تُصَلِّي عَلَيْهِ الْمَلاَئِكَةُ إِذَا أُكِلَ عِنْدَهُ حَتَّى يَفْرُغُوا وَرُبَّمَا قَالَ حَتَّى يَشْبَعُوا  

From the Prophet, that is similar, except that he did not mention "Until they finish, or they have eating their fill."  

عَنِ النَّبِيِّ ﷺ نَحْوَهُ وَلَمْ يَذْكُرْ فِيهِ حَتَّى يَفْرُغُوا أَوْ يَشْبَعُوا