It is narrated from Sayyiduna Ali (may Allah be pleased with him) that he drank (water) standing, and it was said to him: "Do you drink standing?" He said: "I do so, because I have seen the Messenger of Allah (peace and blessings be upon him) doing it. If I drink standing, I have seen the Messenger of Allah (peace and blessings be upon him) drinking standing, and if I drink sitting, I have also seen the Messenger of Allah (peace and blessings be upon him) drinking sitting."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Warqa' except Asad bin Musa."
Hadith Referenceالمعجم الأوسط / باب الميم / 8927
Hadith Takhrij«أخرجه أحمد فى «مسنده» برقم: 806، 931، 1140، 1143، 1155، والبزار فى «مسنده» برقم: 811، 813، 812، وابن أبي شيبة فى «مصنفه» برقم: 24582، 24585، 24594، والطحاوي فى «شرح معاني الآثار» برقم: 6842، 6843، 6844، والطحاوي فى «شرح مشكل الآثار» برقم: 2106، 2107»