رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1780
The Book of the Prohibited actions
Prohibition of Malpractices in Commerce
وَعَنْ عُقْبَةَ بْنِ عَامِرٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ قَالَ: الْمُؤْمِنُ أَخُو الْمُؤْمِنِ، فَلاَ يَحِلُّ لمؤمن أَنْ يَبْتَاعَ عَلَى بَيْعِ أَخِيهِ وَلاَ يَخْطُبَ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَذَرَ ((رَوَاهُ مُسْلِم)).
'Uqbah bin 'Amir (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "A Mu'min is the brother of another Mu'min; and thus it is not permissible for a Mu'min to make an offer while the offer of his brother is pending, nor should he make a proposal of marriage while that of his brother is pending till he withdraws his proposal." [Muslim].
Riyad as-Salihin, 1780