Musnad Ahmad 30:2321

Hassan narrated to us, he said: Shayban narrated to us, from Yahya, he said: Abu Salamah narrated to me, that he heard Abu Hurairah saying: The Messenger of Allah, peace and blessings of Allah be upon him, said: "A woman shall not be married [at the same time] with her maternal aunt, nor a woman with her paternal aunt."