The Messenger of Allah ﷺ said, "A woman is not to be married while her paternal aunt or maternal aunt is also married to the same man."
حدثنا جبارة بن المغلس حدثنا أبو بكر النهشلي حدثني
قال رسول الله ﷺ لا تنكح المرأة على عمتها ولا على خالتها
[Sahih] See no. 740 for its defect, and no. 1929 as a corroborating witness for it.