Musnad Ahmad 1153:999

'Affan narrated to us, Hammad narrated to us, he said: 'Abd al-Rahman ibn al-Qasim informed us, from al-Qasim, from 'Aisha, she said: "Sawda was a slow, heavy woman, so she asked the Prophet, may Allah bless him and grant him peace, for permission to depart from Jam' (Muzdalifah) before he stood (for the morning prayer). And I wished that I had asked him for permission, and he had permitted me." And al-Qasim used to dislike departing until he had stood.