Musnad Ahmad 30:3558

Rawh narrated to us, Hisham narrated to us, from Muhammad, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "A man shall not outbid his brother, nor shall he propose to a woman to whom his brother has proposed, nor shall a woman be married [in a way that is] over her paternal aunt, nor over her maternal aunt. And a woman shall not ask for the divorce of her sister [in faith] so as to empty her dish, for she shall only have what Allah has written for her."