Musnad Ahmad 5:802

'Abdullah narrated to us, Abu 'Abd al-Rahman 'Abdullah ibn 'Umar narrated to us, Ibn Fudayl narrated to us, from al-A'mash, from 'Abd al-Malik ibn Maysarah, from al-Nazzal ibn Sabrah, from 'Ali (may Allah be pleased with him): "He drank while he was standing," then he said: "Thus I saw the Messenger of Allah (peace and blessings of Allah be upon him) do."