Ibn ‘Abbās (may Allah be pleased with him) informs us that he gave the Prophet (may Allah's peace and blessings be upon him) water to drink from Zamzam, and he drank it while standing. Also, ‘Ali ibn Abi Tālib (may Allah be pleased with him) drank while standing, and said that the Prophet (may Allah's peace and blessings be upon him) did the same. Likewise, ‘Abdullāh ibn ‘Amr (may Allah be pleased with him) reported that he saw the Prophet (may Allah's peace and blessings be upon him) drinking while standing and while sitting.