Musnad Abu Ya'la al-Mawsili 150:7

Suwayd ibn Sa'id narrated to us, Salih ibn Musa al-Talhi narrated to us, from Mu'awiyah ibn Ishaq, from 'A'ishah bint Talhah, from 'A'ishah, the Mother of the Believers, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The jihad of women is the Hajj."