[Machine] From the Prophet ﷺ that he said: "None of you should outbid his brother upon his bid. If it is certain and I am not certain about it, then it is similar to one who does not propose to his brother's betrothed and does not outbid his bid when the seller is satisfied and allows the sale to take place before the final sale. Even if he sells, he must abide by this. The Messenger of Allah ﷺ bought from someone who added and sold to someone who added to his brother's bid. However, the seller was not satisfied with the first bid until he sought an increase. Abu Abdullah al-Hafiz informed us, Abu al-Abbas informed us, Rabi' informed us, and al-Shafi'i mentioned it. The sheikh said: The hadith of outbidding has been proven from multiple angles."  

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ لَا يَسُومُ أَحَدُكُمْ عَلَى سَوْمِ أَخِيهِ فَإِنْ كَانَ ثَابِتًا وَلَسْتُ أَحْفَظُهُ ثَابِتًا فَهُوَ مِثْلَ لَا يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ وَلَا يَسُومُ عَلَى سَوْمِهِ إِذَا رَضِيَ الْبَائِعُ وَأَذِنَ بِأَنْ يُبَاعَ قَبْلَ الْبَيْعِ حَتَّى لَوْ بِيعَ لَزِمَهُ قَالَ وَرَسُولُ اللهِ ﷺ بَاعَ فِيمَنْ يَزِيدُ وَبَيْعُ مَنْ يَزِيدُ سَوْمُ رَجُلٍ عَلَى سَوْمِ أَخِيهِ وَلَكِنَّ الْبَائِعَ لَمْ يَرْضَ السَّوْمَ الْأَوَّلَ حَتَّى طَلَبَ الزِّيَادَةَ أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أنا أَبُو الْعَبَّاسِ أنا الرَّبِيعُ أنا الشَّافِعِيُّ فَذَكَرَهُ قَالَ الشَّيْخُ حَدِيثُ السَّوْمِ قَدْ ثَبَتَ مِنْ أَوْجُهٍ