Sahih al-Bukhari 5604

Al-Ḥumaydī narrated to us. He heard Sufyān say: Sālim Abū al-Naḍr informed us that he heard ʿUmayr, the client of Umm al-Faḍl, relate from Umm al-Faḍl. She said: “People were uncertain whether the Messenger of God ﷺ was fasting on the day of ʿArafah, so I sent him a vessel containing milk, and he drank it.” Sufyān would sometimes say: “People were uncertain whether the Messenger of God ﷺ was fasting on the day of ʿArafah, so Umm al-Faḍl sent it to him.” When pressed about the attribution, he would say: “It is from Umm al-Faḍl.”