Musnad Ahmad 1273:3

Sufyan narrated to us, from ‘Amr, who said: I heard Salim ibn Shawwal say, from Umm Habibah, who said: "We used to depart in the darkness of the early morning during the time of the Messenger of Allah, may Allah bless him and grant him peace; we would depart in the darkness of the early morning from Jam’ [Muzdalifah] to Mina." And he said once: She said, "We used to depart in the darkness of the early morning during the time of the Messenger of Allah, may Allah bless him and grant him peace, from Al-Muzdalifah to Mina."