What is the ruling on one who stood at Arafah before dawn on the Day of Sacrifice, then proceeded to perform Tawaf, Sa'i, and stone Jamrat al-Aqaba, but did not stand there during the day, and intentionally left out the stay at Muzdalifah?

Standing at Arafat is the greatest pillar of Hajj. Its time extends from the midday decline of the sun on the Day of Arafat until the dawn of the Day of Sacrifice. According to the Hanbalis, it begins from the dawn of the Day of Arafat. Whoever stands during the day and departs before sunset, their Hajj is valid, but they owe a sacrifice (dam) for neglecting an obligation. Whoever stands only at night, their Hajj is valid, and they owe nothing. As for standing at Muzdalifah, it is an obligation according to the four imams, and whoever omits it owes a sacrifice (dam).