The standing (wuquf) at عرفة is unanimously considered the greatest pillar (ركن) of الحج, based on النبي's statement: 'الحج is عرفة.' The time for this standing extends from the zenith (zawal) of the sun on the 9th of ذو الحجة until the dawn (fajr) of the 10th. النبي (صلى الله عليه وسلم) stood at عرفة and did not depart until after the sun had set, which establishes the السنة of remaining until sunset. The question arises: what is the ruling if a الحاج departs before sunset?
The majority of scholars — Maliki, Shafi'i, and Hanbali — hold that remaining at عرفة until after sunset is واجب (واجب) for those who arrived during the daytime. If a الحاج departs before sunset and does not return before dawn, they must offer a dam (sacrifice a sheep) as a penalty, though their الحج remains valid. The reasoning is that النبي consistently stayed until sunset and said, 'Take your rituals from me,' establishing sunset as the boundary. However, if the الحاج returns to عرفة before fajr — even briefly — the penalty is lifted عند many scholars.
The Hanafi school agrees that staying until sunset is واجب and that leaving early incurs a dam penalty. However, they emphasize that the actual pillar of standing at عرفة is fulfilled by even a momentary presence within the boundaries of عرفة during the valid time, regardless of whether one stays until sunset. This means a الحاج who passes through عرفة briefly has fulfilled the ركن but missed the واجب of staying until sunset. All four schools agree that if a الحاج only arrives at عرفة after sunset (during the night), their standing is valid and no penalty is due — the night portion of wuquf is sufficient on its own.