Musnad Ahmad 22:21

'Affan narrated to us, Shu'bah narrated to us, Mushash informed me, from 'Ata' ibn Abi Rabah, from Ibn 'Abbas, from al-Fadl ibn 'Abbas, who said: "The Messenger of Allah, peace and blessings of Allah be upon him, commanded the weak ones of Banu Hashim; he commanded them to depart from Muzdalifah by night."