Musnad Ahmad 1153:1307

Abu Ahmad narrated to us, Sufyan narrated to us, from Mu'awiyah ibn Ishaq, from 'Aishah bint Talhah, from 'Aishah, who said: We asked the Prophet, peace and blessings of Allah be upon him, for permission for Jihad. He said: "Your Jihad is the Hajj, or your Jihad is the Hajj."