The Messenger of Allah ﷺ said, "A man must not bargain over the sale his brother is making, nor propose marriage where his brother has already proposed. A woman must not stipulate the divorce of her sister so as to empty her bowl, for she will have only what Allah has written for her."
حدثنا هاشم حدثنا أيوب عن أبي كثير
قال رسول الله ﷺ لا يبتاع الرجل على بيع أخيه ولا يخطب على خطبته ولا تشترط المرأة طلاق أختها لتستفرغ صحفتها فإنما لها ما كتب الله عز وجل لها