It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said: I asked the Messenger of Allah (peace and blessings be upon him) whether jihad is also obligatory upon women. He (peace and blessings be upon him) said: "Their jihad is here," and he (peace and blessings be upon him) pointed with his hand towards Makkah.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20012