«لا يخطب الرجل على خطبة أخيه ولا يسوم على سوم أخيه ولا تنكح المرأة على عمتها ولا على خالتها ولا تسأل المرأة طلاق أختها لتكفأ صحفتها ولتنكح فإنما لها ما كتب الله لها»
The Prophet (peace and blessings be upon him) said:
"A man should not propose marriage over the proposal of his brother, nor bid over the bid of his brother; a woman should not be married together with her paternal aunt or her maternal aunt; and a woman should not ask for her sister's divorce in order to empty her bowl and marry him herself, for she will only get what Allah has decreed for her."
Hadith Referenceصحیح الجامع الصغیر / حرف اللام ألف / 7666