حَدَّثَنَا يَحْيَى بْنُ حَكِيمٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏ "‏ لاَ يَخْطُبِ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ ‏"‏ ‏.‏

It was narrated from Ibn Umar that:the Messenger of Allah said: “A man should not propose to a woman to whom his brother has already proposed.”