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.
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."
