Musnad Ahmad 1153:618

Bahz narrated to us, Hammad ibn Salamah narrated to us, he said: Abd al-Rahman ibn al-Qasim informed us, from his father, from Aisha, she said: "Sawdah was a slow, heavy woman, so she asked the Messenger of Allah, peace and blessings of Allah be upon him, for permission to depart from Jam' (Muzdalifah) before the people stood (for the morning prayer). So he gave her permission." Aisha said: "I wish I had asked him for permission, and he had given me permission." And al-Qasim used to dislike departing before standing (at Muzdalifah).