Musnad Ahmad

Abu Hayyah (may Allah have mercy on him) says that once I saw Sayyiduna Ali (may Allah be pleased with him) urinating in the courtyard, then he called for water and first washed and cleaned both his hands, then rinsed his mouth three times, put water into his nose three times, washed his face three times, washed both his hands up to the elbows three times, wiped his head, washed both his feet up to the ankles, and then took the leftover water from the ablution and drank it while standing, and said: I saw the Prophet (peace and blessings of Allah be upon him) doing exactly as you have seen me do, and I wanted to show you the way of ablution of the Prophet (peace and blessings of Allah be upon him).