[Machine] The Messenger of Allah ﷺ forbade a man from proposing or buying while his brother is engaged.

أَنَّ رَسُولَ اللهِ ﷺ نَهَى أَنْ يَخْطُبَ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ أَوْ يَبْتَاعَ عَلَى بَيْعِهِ