Shaqayq bin Salmah al-Asadi شقيق بن سلمة الأسدي أبو وائل الكوفي · The Book on Purification

"Allah's Messenger came to a waste area used by people, so he urinated on it while standing. I brought him the (water for) Wudu. Then I left to be away from him, but he called me until I was behind him. So he performed Wudu and wiped (Masaba) over his Khuff."

the Prophet would go through his beard."