Maliks Muwatta Book 28, Hadith Number 20.

Section : Combinations of Women Not to be Married Together.

Yahya related to me from Malik from Abu’z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said “One cannot be married to a woman and her paternal aunt, or a woman and her maternal aunt at the same time.”