صحيح البخاري
Sahih Bukhari
كتاب النكاح
The Book of (The Wedlock)
بَابُ لاَ يَخْطُبُ عَلَى خِطْبَةِ أَخِيهِ، حَتَّى يَنْكِحَ أَوْ يَدَعَ:
(46) Chapter. None should ask for the hand of a lady who is already engaged to his brother (Muslim), but one should wait till the first suitor marries her or leaves her.
3 hadith
Hadith 5142
حَدَّثَنَا
مَكِّيُّ بْنُ إِبْرَاهِيمَ ، حَدَّثَنَا
ابْنُ جُرَيْجٍ ، قَالَ : سَمِعْتُ
نَافِعًا يُحَدِّثُ أَنَّ
ابْنَ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا ، كَانَ يَقُولُ : " نَهَى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ يَبِيعَ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ ، وَلَا يَخْطُبَ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَتْرُكَ الْخَاطِبُ قَبْلَهُ ، أَوْ يَأْذَنَ لَهُ الْخَاطِبُ " .
Narrated Ibn `Umar: The Prophet decreed that one should not try to cancel a bargain already agreed upon between some other persons (by offering a bigger price). And a man should not ask for the hand of a girl who is already engaged to his Muslim brother, unless the first suitor gives her up, or allows him to ask for her hand.
Hadith 5143
Narrated Abu Huraira: The Prophet said, "Beware of suspicion (about others), as suspicion is the falsest talk, and do not spy upon each other, and do not listen to the evil talk of the people about others' affairs, and do not have enmity with one another, but be brothers.
Hadith 5144
وَلَا يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَنْكِحَ أَوْ يَتْرُكَ " .
And none should ask for the hand of a girl who is already engaged to his (Muslim) brother, but one should wait till the first suitor marries her or leaves her."