Musannaf Ibn Abi Shayba 9:858

Ibn Numayr narrated to us, from Ibn Ishaq, from Ya'qub ibn Nukhba, from Sulayman ibn Yasar, from Abu Sa'id al-Khudri, that the Prophet (peace and blessings of Allah be upon him) said: "A woman shall not be married [at the same time] as her maternal aunt."