Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: the Messenger of Allah (peace and blessings be upon him) gave instructions concerning his wives and the weak members of his household, so they were sent off from Muzdalifah at night; then they kept going until they reached Jamrat al-Aqabah.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11451