Umm 'Umarah Al-Ansariyah (May Allah be pleased with her) reported:
Once the Prophet (ﷺ) visited us and I served him some food. He (ﷺ) asked me to eat. I replied that I was observing (optional) fast. He (ﷺ) said, "When people eat by a person observing fast, the angels keep asking Allah's forgiveness for that person until they have had their fill."[At-Tirmidhi].