Mukhtasar Bukhari

Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) said: (In the period of ignorance) the Quraysh and those who followed their way used to stay at Muzdalifah, and they were called Hums (considering themselves honorable). All the rest of the Arabs used to stay at Arafat. When Islam came, Allah Almighty commanded His Noble Prophet (peace and blessings of Allah be upon him): "First go to Arafat and stay there, then return from there (to Muzdalifah)."