حَدَّثَنَا أَحْمَدُ بْنُ عَمْرِو بْنِ السَّرْحِ، حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لاَ يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ ‏"‏ ‏.‏

Abu Hurairah reported the Apostle of Allaah(PBUH) as saying “ A man should not seek the hand of a woman in marriage when his brother has already sought her hand.” Translation Not Available

Book Ref: Sunan Abi Dawud Book 12 Hadith 2080
Web Ref:  Sunan Abi Dawud Book 11 Hadith 2075