Sunan an-Nasa'i 3296
سنن النسائي#3296SahihIt was narrated that Abu Hurairah said:"The Messenger of Allah forbade taking a woman as a co-wife to her paternal aunt or her maternal aunt
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 26:101