مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 2850
Business Transactions
Business Transactions which are Forbidden - Section 1
وَعَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا يَبِعِ الرَّجُلُ عَلَى بَيْعِ أَخِيهِ وَلَا يَخْطِبْ عَلَى خِطْبَةِ أَخِيهِ إِلَّا أنْ يأذَنَ لَهُ» . رَوَاهُ مُسلم
He reported God’s Messenger as saying, “One must not offer more than the amount agreed by his brother*, or ask a woman in marriage when his brother has done so, unless he permits him.” *i.e. when the parties have already agreed on a price. Muslim transmitted it.
Mishkat al-Masabih, 2850صَحِيحٌ (الألباني)