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Narrated `Aisha: (That she said), "O Allah's Messenger! 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).
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا خَالِدٌ، حَدَّثَنَا حَبِيبُ بْنُ أَبِي عَمْرَةَ، عَنْ عَائِشَةَ بِنْتِ طَلْحَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ أَنَّهَا قَالَتْ يَا رَسُولَ اللَّهِ تُرَى الْجِهَادَ أَفْضَلَ الْعَمَلِ، أَفَلاَ نُجَاهِدُ قَالَ " لَكِنَّ أَفْضَلَ الْجِهَادِ حَجٌّ مَبْرُورٌ ".
sunnah.com