Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) said: We were travelling with the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) struck the neck of my mount with his hand, then said: "Do you have water with you?" I said: Yes, I have this leather vessel of water with me. He (peace and blessings be upon him) said: "Leave it." Then he (peace and blessings be upon him) dismounted and relieved himself, then came to me and said: "Do you need to relieve yourself?" I said: No. So he (peace and blessings be upon him) washed his hands three times, rinsed his mouth and put water into his nose three times, then washed his face three times. Then he intended to bring out his forearms, but he (peace and blessings be upon him) was wearing a tight woollen cloak (jubbah) and he (peace and blessings be upon him) could not bring his forearms out of it, so he (peace and blessings be upon him) brought his hands out from underneath the cloak, then washed his forearms three times each, then wiped over his head and wiped over his leather socks. Then we went on and caught up with the people, and Abdur Rahman bin Awf (may Allah be pleased with him) was leading them in prayer. I wanted to inform him of the presence of the Prophet (peace and blessings be upon him), but he (peace and blessings be upon him) stopped me. So we prayed one rak'ah with him, then completed the second rak'ah ourselves.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18047