Musnad Ahmad

Abu Hayyah 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, and 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 be upon him) doing the same, and I wanted to show you the way the Prophet (peace and blessings be upon him) performed ablution.