The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj)
Dawud :: Book 10 : Hadith 1990
Narrated AbdurRahman ibn AbuBakr:
Hafsah, daughter of AbdurRahman ibn AbuBakr, reported on the authority of her father: The Apostle of Allah (peace_be_upon_him) said to AbdurRahman: AbdurRahman, put your sister Aisha on the back of the camel behind you and make her perform umrah from at-Tan'im. When you come down from the hillock (in at-Tan'im), she must wear (ihram for umrah), for this is an umrah accepted (by Allah).