For 10 points, name this pillar of Islam that Muslims must do at least once in a lifetime that involves a pilgrimage to Mecca.
In preparation for this action, men are to dress in only two sheets of white unhemmed cloth called an ihram. On the first day of this action, tawaf occurs. Other parts of this action involve drinking water in order to represent Hagar's struggle to find water for Ishmael from the [*] Zamzam Well and staying on Mt. Arafat for an afternoon. In Mina, participants in this action "stone the devil." The most important part of this event involves walking seven times around the Ka'bah. For 10 points, name this pillar of Islam that Muslims must do at least once in a lifetime that involves a pilgrimage to Mecca.
In preparation for this action, men are to dress in only two sheets of white unhemmed cloth called an ihram.
{hajj} [accept “doing {hajj}” and equivalents”]