Arabic (Original)
وَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا يَبِعْ أَحَدُكُمْ عَلَى بَيْعِ أَخِيهِ وَلَا يَخْطُبْ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ.
English Translation
The Messenger of Allah (peace be upon him) said: 'None of you should buy over the sale of his brother, and none of you should propose marriage over the proposal of his brother.'