Umayr reported,

Umm Fadl bint Harith reported that some people disputed in her presence on the day of Arafah about whether the Messenger of Allah ﷺ was fasting. Some of them said, "He is fasting."Others said, "He is not fasting."So she sent him a cup of milk while he was at Arafah, and he drank it.

Muslim 2634

Sahih

حدثني زهير بن حرب حدثنا عبد الرحمن بن مهدي عن سفيان عن سالم أبي النضر بهذا الإسناد نحو حديث ابن عيينة وقال عن عمير مولى أم الفضل

مسلم 2634صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Fasting
Chapter
Recommendation of breaking the fast for the pilgrim at Arafat on the day of Arafah
Numbering
Darussalam 2634
Muslim 2634