The Muslim should not purchase in opposition to his brother, and he should not make the proposal of marriage on the proposal already made by his brother.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَسُمِ الْمُسْلِمُ عَلَى سَوْمِ أَخِيهِ وَلاَ يَخْطُبْ عَلَى خِطْبَتِهِ  

Abu Hurairah reported the Apostle of Allaah ﷺ as saying “ A man should not seek the hand of a woman in marriage when his brother has already sought her hand.”  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ  

the Messenger of Allah said: “A man should not propose to a woman to whom his brother has already proposed.”  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَخْطُبِ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ  

the Messenger of Allah said: “A man should not propose to a woman to whom his brother has already proposed.”  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَخْطُبِ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ  

"A man is not to undersell his brother, nor is he to fry to outhaggle his brother."  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ يَبِيعُ الرَّجُلُ عَلَى بَيْعِ أَخِيهِ وَلاَ يَسُومُ عَلَى سَوْمِ أَخِيهِ  

A man must not make proposal of marriage to a woman when his brother has done so already. And he must not offer a price for a thing for which his brother had already offered a price; and a woman must not be combined in marriage with her father's sister, nor with her mother's sister, and a woman must not ask to have her sister divorced in order to deprive her of what belongs to her, but she must marry, because she will have what Allah has decreed for her. (Using translation from Muslim 1408g)  

عَنِ النَّبِيِّ ﷺ قَالَ لَا يَسُومُ الرَّجُلُ عَلَىسَوْمِ أَخِيهِ وَلَا يَخْطُبْ عَلَى خِطْبَةِ أَخِيهِ  

[Machine] On the authority of the Prophet ﷺ , he said: "A man should not outbid his brother's bidding, nor propose to a woman who has already been proposed to."  

عَنِ النَّبِيِّ ﷺ قَالَ لَا يَسْتَامُ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَلَا يَخْطُبُ عَلَى خِطْبَتِهِ  

[Machine] The Prophet ﷺ forbade a man from feeling envious about his brother's fasting or proposing to the same woman he intends to propose to.  

أَنَّ النَّبِيَّ ﷺ نَهَى أَنْ يَسْتَامَ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ أَوْ يَخْطُبَ عَلَى خِطْبَتِهِ  

[Machine] The translation of the passage is: "The Messenger of Allah ﷺ said: A man should not observe fasting on the day his brother Muslim is observing fasting, nor should he propose marriage to the woman his brother has proposed to."  

عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ قَالَ لَا يَسُومُ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ الْمُسْلِمِ وَلَا يَخْطُبُ عَلَى خِطْبَتِهِ  

Abu Hurairah reported the Apostle of Allaah ﷺ as saying “ A man should not seek the hand of a woman in marriage when his brother has already sought her hand.” (Using translation from Abū Dāʾūd 2080)   

قَالَ رَسُولُ اللهِ ﷺ لَا يَسْتَامُ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَلَا يَخْطُبْ عَلَى خِطْبَةِ أَخِيهِ  

Abu Hurairah reported the Apostle of Allaah ﷺ as saying “ A man should not seek the hand of a woman in marriage when his brother has already sought her hand.” (Using translation from Abū Dāʾūd 2080)  

قَالَ رَسُولُ اللهِ ﷺ «لَا يَخْطُبِ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ»