The Messenger of Allah ﷺ asked for water to drink, so I brought him a cup of water. There was a hair in it, which I picked out. He said, "O Allah, beautify him."The narrator said, "I saw him at the age of ninety-four, and there was not a single white hair in his beard."
حدثنا زيد بن الحباب حدثنا حسين حدثني أبو نهيك حدثني
استسقى رسول الله ﷺ ماء فأتيته بقدح فيه ماء فكانت فيه شعرة فأخذتها فقال اللهم جمله قال فرأيته وهو ابن أربع وتسعين ليس في لحيته شعرة بيضاء
Its isnad is sahih. Husayn is Ibn Waqid Marwazi the judge, trustworthy, whose hadith appears in Muslim and the four Sunan. Abu Nahik is Uthman bin Nahik Azdi Farahidi, a specialist in Quranic readings, deemed trustworthy, whose hadith appears in Abu Dawud. The hadith has already appeared at 20611 from Abu Zayd himself.