Narrated Um Al-Fadl: The people doubted whether the Prophet was observing the fast on the Day of `Arafat, so I sent something for him to drink and he drank it.
Hadith Referenceصحيح البخاري / كتاب الحج / 1658
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة