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

The Prophet ﷺ said: One of you must not ask a woman in marriage when his brother has done so already, and one of you must not sell (his own goods) when his brother has already sold (his goods) except with his permission.

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ وَلاَ يَبِيعُ عَلَى بَيْعِ أَخِيهِ إِلاَّ بِإِذْنِهِ

Yahya related to me from Malik from Muhammad ibn Yahya ibn Habban from al-Araj from Abu Hurayra that the Messenger of Allah ﷺ said, "Do not ask for a woman in marriage when another muslim has already done so."

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ

The Prophet ﷺ said: One of you must not ask a woman in marriage when his brother has done so already, and one of you must not sell (his own goods) when his brother has already sold (his goods) except with his permission. (Using translation from Abū Dāʾūd 2081)

أَنَّ رَسُولَ اللهِ ﷺ قَالَ لَا يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ وَلَا يَبِيعُ عَلَى بَيْعِ أَخِيهِ إِلَّا بِإِذْنِهِ

The Prophet ﷺ said: One of you must not ask a woman in marriage when his brother has done so already, and one of you must not sell (his own goods) when his brother has already sold (his goods) except with his permission. (Using translation from Abū Dāʾūd 2081)

وَقَالَ رَسُولُ اللهِ ﷺ لَا يَبِعْ أَحَدُكُمْ عَلَى بَيْعِ أَخِيهِ وَلَا يَخْطُبْ أَحَدُكُمْ عَلَى خِطْبَةِ 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

It was narrated from Abu Hurairah that the Prophet said: "None of you should propose marriage to a woman when someone else has already proposed to her." (Using translation from Nasāʾī 3240)

أَنَّ رَسُولَ اللهِ ﷺ قَالَ لَا يَخْطُبُ أَحَدُكُمْ 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 يَسْتَامُ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَلَا يَخْطُبْ عَلَى خِطْبَةِ أَخِيهِ

The Prophet ﷺ said: One of you must not ask a woman in marriage when his brother has done so already, and one of you must not sell (his own goods) when his brother has already sold (his goods) except with his permission. (Using translation from Abū Dāʾūd 2081)

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «لَا يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ وَلَا يَبِيعُ عَلَى بَيْعِ أَخِيهِ حَتَّى يَأْذَنَ لَهُ»

It was narrated from Abu Hurairah that the Prophet said: "None of you should propose marriage to a woman when someone else has already proposed to her." (Using translation from Nasāʾī 3240)

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «لَا يَخْطُبْ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ»

It was narrated from Abu Hurairah that the Prophet said: "None of you should propose marriage to a woman when someone else has already proposed to her." (Using translation from Nasāʾī 3240)

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَا يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ»

[Machine] A man should not compete with his brother's bid, nor propose to his brother's betrothed. Hisham raised it.

«لَا يَسُمِ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَلَا يَخْطُبُ عَلَى خِطْبَةِ أَخِيهِ» رَفَعَهُ هِشَامٌ

[Machine] The Messenger of Allah ﷺ said: "None of you should propose on the proposal of his brother, nor should he sell upon the sale of his brother."

أَنَّ رَسُولَ اللهِ ﷺ قَالَ لَا يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ وَلَا يَبِيعُ عَلَى بَيْعِ أَخِيهِ

[Machine] The Messenger of Allah ﷺ said, "One of you should not fast on his brother's fast, nor should he propose to the one who has already been proposed to, and this is the wording."

قَالَ رَسُولُ اللهِ ﷺ لَا يَسُومَنَّ أَحَدُكُمْ عَلَى سَوْمِ أَخِيهِ وَلَا يَخْطُبْ عَلَى خِطْبَتِهِ وَبِهَذَا اللَّفْظِ

"لَا يَخْطُب أحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ".