The Prophet (peace and blessings of Allah be on him) said,
“Although I am staying here, you may stay anywhere throughout Muzdalifah.” [Muslim]
Muzalifah is also mentioned in Surah Baqarah in the Quran where Allah (Glorified and Exalted is He) says,
“When you leave Arafat, then remember Allah at the Mash’arul Haram.”