Imam al-Zuhri (may Allah have mercy on him) relates that the Messenger of Allah (peace and blessings be upon him) said: "If the knowledge of the women of this Ummah were gathered together, including the wives of the Prophet (peace and blessings be upon him), the knowledge of Aishah (may Allah be pleased with her) would be greater than the knowledge of all of them."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19603