Staying in arafat
If a pilgrim cannot go on the eve of 8th Dhul Hijja to Mina but it is possible for him to stay that night at ‘Arafat or if he decided to stay that night in Mecca, then it is better for him to spend the night in remembrance of Allah (doing tashbih, rukū‘, sujūd and istaghfar) till the 9th of Dhul Hijja, the day when all pilgrims will gather in the plains of ‘Arafat (21 k.m. from Mecca).
The jurists’ expression “staying in ‘Arafat” means “the presence” of the pilgrims in ‘Arafat no matter whether they are riding, walking, standing, sitting, lying down or moving around.
It is obligatory to stay in ‘Arafat from the zuhr time till the maghrib time with the sincerity of intention by saying, for example, “I am staying in ‘Arafat from the zuhr time of this day to the sunset for hajj at-tamattu‘ to seek the pleasure of Almighty Allah.” Therefore, it is forbidden to leave the plains of ‘Arafat before the sunset for those who know the ruling and are not in any constrains. Based on obligatory precaution, it is necessary to stay till the disappearance of the twilight on the eastern horizon in order to ensure that the sun has fully set.