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

That the Prophet ﷺ came in to her (ʿUmaarah) , and she presented him with food. He said, “Eat,” and she said, “I am fasting.” The Messenger of Allah ﷺ said, “Indeed, the angels pray for the fasting person when people eat in his presence until they finish,” and sometimes he said, “until they are satisfied.”

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