The Prophet ﷺ broke his fast at Arafah when Umm Fadl sent him some milk, and he drank it.
حدثنا أحمد بن منيع حدثنا إسمعيل ابن علية حدثنا أيوب عن عكرمة
أن النبي ﷺ أفطر بعرفة وأرسلت إليه أم الفضل بلبن فشرب
Its isnad is sahih. Ahmad also narrated it in 1/360 from Ismail bin Ulaya through the same chain, and Ibn Hibban graded it sahih (Al-Ihsan): 3596.On the same topic, there are reports from Abu Hurairah [Abu Dawud, no. 2440], Ibn Umar [to come, no. 751], and Umm Fadl [Bukhari, no. 1988, and Muslim, no. 1123].