Abdu Khair (may Allah have mercy on him) says that once Sayyiduna Ali (may Allah be pleased with him) asked for water to perform ablution and said: Where are those people who think that in no situation is it permissible to drink water while standing? Then he took the vessel and drank its water while standing, then performed a light ablution, wiped over his shoes, and said: This is the ablution of a pure person who is not without ablution; this is the way the Prophet (peace and blessings be upon him) used to perform ablution.