Sayyidah Aishah (may Allah be pleased with her) said: We said: "O Messenger of Allah, we consider jihad the best of deeds; should we not wage jihad with you?" He (peace and blessings be upon him) said: "No; but the best jihad (for women) is an accepted Hajj (Hajj mabrur)."
Al-Bukhari recorded it in the Sahih from Abd al-Rahman bin al-Mubarak, from Khalid bin Abdullah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17805