Hadith
حَدَّثَنِي عَمْرُو بْنُ عَبَّاسٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ، حَدَّثَنَا سُفْيَانُ، عَنْ سَالِمٍ أَبِي النَّضْرِ، عَنْ عُمَيْرٍ، مَوْلَى أُمِّ الْفَضْلِ عَنْ أُمِّ الْفَضْلِ، أَنَّهُمْ شَكُّوا فِي صَوْمِ النَّبِيِّ صلى الله عليه وسلم يَوْمَ عَرَفَةَ، فَبُعِثَ إِلَيْهِ بِقَدَحٍ مِنْ لَبَنٍ فَشَرِبَهُ.
Narrated Um Al-Fadl:that the people were in doubt whether the Prophet (ﷺ) was fasting on the Day of `Arafat or not, so a (wooden) drinking vessel full of milk was sent to him, and he drank it
Sahih
Sahih al-Bukhari 5636 ·Book 74, Hadith 62·Also available on sunnah.com·