Hadith.2189 - "The pilgrim, when they stand at Al-Mash'ar (Muzdalifah), is cleansed of their sins."
Standing at Arafah is a Sunnah, while standing at Al-Mash'ar is an obligation. On the Day of Sacrifice (Eid al-Adha), there is no deed better than spilling the blood of a sacrificial animal, walking to serve one's parents, reconciling with estranged relatives by treating them with kindness and initiating greetings, or a person who shares the meat of their sacrifice with their neighbors, including orphans, the needy, servants, and prisoners, ensuring their well-being.