Musnad Ahmad 1153:808

Abu Ahmad narrated to us, he said: Isa ibn Abd al-Rahman al-Bajali al-Sulami narrated to us, from his mother, who said: I asked Aisha about the Umrah after the Hajj. She said: "The Messenger of Allah (peace and blessings of Allah be upon him) sent my brother with me, so I went out from the Haram and performed Umrah."