"The Messenger of Allah forbade offering more for something that has already been bought by his brother, or for a man to propose marriage to a woman when someone else has already proposed to her, unless the previous suitor gave up the idea or gave him permission."  

أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ يَقُولُ نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَبِيعَ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَلاَ يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ الرَّجُلِ حَتَّى يَتْرُكَ الْخَاطِبُ قَبْلَهُ أَوْ يَأْذَنَ لَهُ الْخَاطِبُ  

[Machine] The Messenger of Allah ﷺ forbade selling a sale that has already been made and he used to say, "Do not overbid in transactions and do not sell what has already been bought, and do not propose to a woman who is already engaged to her brother until he leaves or gives permission to propose."  

نَهَى رَسُولُ اللهِ ﷺ أَنْ يَبِيعَ حَاضِرٌ لِبَادٍ وَكَانَ يَقُولُ لَا تَلَقَّوْا الْبُيُوعَ وَلَا يَبِعْ بَعْضٌ عَلَى بَيْعِ بَعْضٍ وَلَا يَخْطُبْ أَحَدُكُمْ أَوْ أَحَدٌ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَتْرُكَ الْخَاطِبُ الْأَوَّلُ أَوْ يَأْذَنَ لَهُ فَيَخْطُبَ  

[Machine] "From the Prophet of Allahﷺ he said, 'A man should not propose to his brother's betrothed until the first proposer either abandons his proposal or gives permission to the second proposer to proceed.'"  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ «لَا يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَتْرُكَ الْخَاطِبُ الْأَوَّلُ أَوْ يَأْذَنَ لَهُ فَيَخْطُبُ»  

"The Messenger of Allah forbade offering more for something that has already been bought by his brother, or for a man to propose marriage to a woman when someone else has already proposed to her, unless the previous suitor gave up the idea or gave him permission." (Using translation from Nasāʾī 3243)  

أَنَّ عَبْدَ اللهِ بْنَ عُمَرَ كَانَ يَقُولُ «نَهَى رَسُولُ اللهِ ﷺ أَنْ يَبِيعَ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَلَا يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ الرَّجُلِ حَتَّى يَتْرُكَ الْخَاطِبُ قَبْلَهُ أَوْ يَأْذَنَ لَهُ الْخَاطِبُ»  

The Prophet ﷺ decreed that one should not try to cancel a bargain already agreed upon between some other persons (by offering a bigger price). And a man should not ask for the hand of a girl who is already engaged to his Muslim brother, unless the first suitor gives her up, or allows him to ask for her hand. (Using translation from Bukhārī 5142)   

أَنَّ ابْنَ عُمَرَ ؓ كَانَ يَقُولُ نَهَى رَسُولُ اللهِ ﷺ أَنْ يَبِيعَ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَلَا يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَتْرُكَ الْخَاطِبُ قَبْلَهُ أَوْ يَأْذَنَ لَهُ الْخَاطِبُ