Worship and the Pillars

Ibn 'Abbas (May Allah be pleased with them) reported: It was the practice of the Messenger of Allah (ﷺ) to not to omit fast on 'bright days' whether he was staying at a place or on a journey..

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."