Umm Umara bint Kaab reported,

The Prophet ﷺ came in to visit her, and she brought him some food.He said, "Eat."She replied, "I am fasting."The Messenger of Allah ﷺ then said, "When someone eats in the presence of a fasting person, the angels invoke blessings upon that fasting person until they finish." And sometimes he said, "until they have eaten their fill."

Tirmidhi 786

Hasan

حدثنا محمد بن بشار حدثنا محمد بن جعفر حدثنا شعبة عن حبيب بن زيد عن مولاة لهم يقال لها ليلى عن جدته أم عمارة بنت كعب عن النبي ﷺ نحوه ولم يذكر فيه حتى يفرغوا أو يشبعوا

الترمذي 786حسن
Contents
Reference
Commentary
Ayat
Collection
Jami Tirmidhi
Book
Fasting
Chapter
Virtue of the fasting person when others eat in his presence
Numbering
Darussalam 786
Tirmidhi 786