What is prescribed for the pilgrim at the standing at 'Arafah, and when do the pilgrims depart from it?

Question : Honorable Shaykh, what is prescribed for the pilgrim at the standing at 'Arafah? And when do the pilgrims depart from it?

Answer : On the Day of 'Arafah, Muslims pray the midday and afternoon prayers combined and shortened. Then the pilgrim devotes himself to supplication and remembrance, and he seizes the opportunity in the last part of the day for supplication, pleading, and the remembrance of Allah (Mighty and Majestic), reciting the Qur'an, and other such acts. He remains thus, facing the qiblah, raising his hands, supplicating to Allah (Glorified and Exalted is He) and remembering Him until the sun sets. When the sun sets, he departs to Muzdalifah. He does not depart from 'Arafah before the sun has set.
Here I pause to say to the pilgrim: Be careful of the boundaries of 'Arafah. Some people descend before reaching 'Arafah and remain in their place until the sun sets, then they depart from their place without going to 'Arafah. Then some other people follow their example and descend with them.
This results in a great error. Because whoever does not stand at 'Arafah returns without a Hajj, based on the saying of the Prophet (peace and blessings be upon him): "Hajj is 'Arafah."