Sahih al-Bukhari — Fighting for the Cause of Allah (Jihaad) — Hadith No: 2784
Translation
Narrated `Aisha:(That she said), "O Allah's Messenger (ﷺ)! We consider Jihad as the best deed. Should we not fight in Allah's Cause?" He said, "The best Jihad (for women) is Hajj-Mabrur (i.e. Hajj which is done according to the Prophet's tradition and is accepted by Allah)