Majma al-Zawaid — Hadith 9653

Sayyidah Umm Kabshah (may Allah be pleased with her), a woman of Udhrah, a branch of Banu Quda'ah, narrates that she submitted: "O Messenger of Allah, permit me to set out with such-and-such army." The Prophet (peace and blessings be upon him) said: "No." She submitted: "O Messenger of Allah, I will not fight; I will tend to the wounded and the sick and give water to the sick." The Prophet (peace and blessings be upon him) said: "Were it not for the fear that this would become a precedent (sunnah), and that it would be said: 'Such-and-such a woman also went out,' I would have given you permission. But stay at home."
Al-Tabarani recorded it in al-Mu'jam al-Kabir and al-Mu'jam al-Awsat; the narrators of both are the narrators of the Sahih.