‘There is no sin on you that you seek the grace of your Lord (by trading). Later, when you flow down from ‘Arafāt, recite the name of Allah near Al-Mash‘ar-ul-Harām (the Sacred Monument), and recite His name as He has guided you, while before it, you were among the astray.’ [Qur’an 2:198]
Muzdalifa is a valley between ‘Arafah and Mina. Stretching just over 4 kilometres long, it is where the Pilgrims gather in the night of the 9th of Dhul Hijjah after having spent it’s day in ‘Arafah.
Pilgrims spend the night here and many of them collect their pebbles for pelting the Shaytan at the Jamaraat.
There is a Masid here called Masjid Mash’ar Al-Haram which is located on the spot where the Prophet (peace be upon him) supplicated in response to the injunction of the above verse from Surah Al Baqarah 2:198.
Muzdalifa is also known as Al Jam’, meaning joining or gathering, because it is where the pilgrims join the Maghrib and ‘Esha prayers. It is also known by this name because it’s a place of gathering.