Arbaeen, meaning “forty” in Arabic, is observed by Shia Muslims 40 days after Ashura, commemorating the martyrdom of Imam Husayn ibn Ali in the Battle of Karbala in 680 AD. Consequently, it marks the end of the mourning period for Husayn. Millions of Shia Muslims participate in the Arbaeen Walk, a pilgrimage to Husayn’s shrine in Karbala, Iraq. Moreover, this gathering, one of the largest in the world, involves reciting supplications, reflecting on Husayn’s sacrifice, and fostering a sense of unity and commitment to justice and righteousness.