The Mother of the Believers, Sayyidah Aishah al-Siddiqah (may Allah be pleased with her), says that his (peace and blessings be upon him) pure wives asked him (peace and blessings be upon him) for permission to go on jihad, and he (peace and blessings be upon him) said: "Hajj is sufficient for you," or he said: "Hajj is your jihad."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8619