عَنْ عُقْبَةَ بْنِ عَامِرٍ رَضِيَ اللَّهُ عَنْهُ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَقُولُ: ((لَا يَحِلُّ لِامْرِئٍ مُسْلِمٍ يَخْطُبُ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَتْرُكَ، وَلَا يَبِيعْ عَلَى بَيْعِ أَخِيهِ حَتَّى يَتْرُكَ)).
Narrated by Sayyiduna Uqbah bin Amir (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: It is not lawful for a Muslim man to send a proposal for engagement over the engagement of his brother, until he leaves it. Similarly, no man should make a deal over the deal of his brother, unless he leaves it.