Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:10899Abū Zakariyyā b. Abū Isḥāq And Ghayruh > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. ʿAbdullāh b. ʿAbd al-Ḥakam > Ibn Wahb > Ibn Lahīʿah Wa-al-Layth b. Saʿd > Yazīd b. Abū Ḥabīb > ʿAbd al-Raḥman b. Shimāsah al-Mahrī > ʿUqbah b. ʿĀmir > al-Minbar

A believer is the brother of a believer, so it is not lawful for a believer to outbid his brother, and he should not propose an engagement when his brother has thus proposed until he gives it up. (Using translation from Muslim 1414)   

البيهقي:١٠٨٩٩وَأَخْبَرَنَا أَبُو زَكَرِيَّا بْنُ أَبِي إِسْحَاقَ وَغَيْرُهُ قَالُوا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ أنا مُحَمَّدُ بْنُ عَبْدِ اللهِ بْنِ عَبْدِ الْحَكَمِ أنا ابْنُ وَهْبٍ أَخْبَرَنِي ابْنُ لَهِيعَةَ وَاللَّيْثُ بْنُ سَعْدٍ عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ شِمَاسَةَ الْمَهْرِيِّ

أَنَّهُ سَمِعَ عُقْبَةَ بْنَ عَامِرٍ عَلَى الْمِنْبَرِ يَقُولُ إِنَّ رَسُولَ اللهِ ﷺ قَالَ الْمُؤْمِنُ أَخُو الْمُؤْمِنِ وَلَا يَحِلُّ لِمُؤْمِنٍ أَنْ يَبْتَاعَ عَلَى بَيْعِ أَخِيهِ حَتَّى يَذَرَ وَلَا يَخْطُبَ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَذَرَ  

رَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنْ أَبِي الطَّاهِرِ عَنِ ابْنِ وَهْبٍ عَنِ اللَّيْثِ

See similar narrations below:

Collected by Muslim, Ṭabarānī, Bayhaqī
muslim:1414Abū al-Ṭāhir > ʿAbdullāh b. Wahb > al-Layth Waghayrih > Yazīd b. Abū Ḥabīb > ʿAbd al-Raḥman b. Shumāsah > ʿUqbah b. ʿĀmir > al-Minbar

A believer is the brother of a believer, so it is not lawful for a believer to outbid his brother, and he should not propose an engagement when his brother has thus proposed until he gives it up.  

مسلم:١٤١٤وَحَدَّثَنِي أَبُو الطَّاهِرِ أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ عَنِ اللَّيْثِ وَغَيْرِهِ عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ شُمَاسَةَ

أَنَّهُ سَمِعَ عُقْبَةَ بْنَ عَامِرٍ عَلَى الْمِنْبَرِ يَقُولُ إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ الْمُؤْمِنُ أَخُو الْمُؤْمِنِ فَلاَ يَحِلُّ لِلْمُؤْمِنِ أَنْ يَبْتَاعَ عَلَى بَيْعِ أَخِيهِ وَلاَ يَخْطُبَ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَذَرَ  

tabarani:15002Muṭṭalib b. Shuʿayb al-Azdī > ʿAbdullāh b. Ṣāliḥ > al-Layth > Yazīd b. Abū Ḥabīb > ʿAbd al-Raḥman b. Shimāsah > ʿUqbah b. ʿĀmir

[Machine] The Messenger of Allah ﷺ said, "A believer is a brother of another believer. It is not permissible for a believer to sell over the sale of his brother until he leaves it, and he should not propose to the woman who is engaged until he leaves her."  

الطبراني:١٥٠٠٢حَدَّثَنَا مُطَّلِبُ بْنُ شُعَيْبٍ الْأَزْدِيُّ ثَنَا عَبْدُ اللهِ بْنُ صَالِحٍ حَدَّثَنِي اللَّيْثُ حَدَّثَنِي يَزِيدُ بْنُ أَبِي حَبِيبٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ شِمَاسَةَ عَنْ عُقْبَةَ بْنِ عَامِرٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «الْمُؤْمِنُ أَخُو الْمُؤْمِنِ لَا يَحِلُّ لِمُؤْمِنٍ أَنْ يَبْتَاعَ عَلَى بَيْعِ أَخِيهِ حَتَّى يَذَرَ وَلَا يَخْطُبَ عَلَى خِطْبَتِهِ حَتَّى يَذَرَ»  

bayhaqi:14036Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū Zakariyyā b. Abū Isḥāq Waʾabū Bakr b. al-Ḥasan al-Qāḍī > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. ʿAbdullāh b. ʿAbd al-Ḥakam > Ibn Wahb > a man Wa-al-Layth b. Saʿd > Yazīd b. Abū Ḥabīb > ʿAbd al-Raḥman b. Shimāsah al-Mahrī > ʿUqbah b. ʿĀmir > al-Minbar

A believer is the brother of a believer, so it is not lawful for a believer to outbid his brother, and he should not propose an engagement when his brother has thus proposed until he gives it up. (Using translation from Muslim 1414)   

البيهقي:١٤٠٣٦أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو زَكَرِيَّا بْنُ أَبِي إِسْحَاقَ وَأَبُو بَكْرِ بْنُ الْحَسَنِ الْقَاضِي قَالُوا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ أنبأ مُحَمَّدُ بْنُ عَبْدِ اللهِ بْنِ عَبْدِ الْحَكَمِ أنبأ ابْنُ وَهْبٍ أَخْبَرَنِي رَجُلٌ وَاللَّيْثُ بْنُ سَعْدٍ عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ شِمَاسَةَ الْمَهْرِيِّ

أَنَّهُ سَمِعَ عُقْبَةَ بْنَ عَامِرٍ عَلَى الْمِنْبَرِ يَقُولُ إِنَّ رَسُولَ اللهِ ﷺ قَالَ الْمُؤْمِنُ أَخُو الْمُؤْمِنِ فَلَا يَحِلُّ لِمُؤْمِنٍ أَنْ يَبْتَاعَ عَلَى بَيْعِ أَخِيهِ حَتَّى يَذَرَ وَلَا يَخْطُبُ عَلَى خِطْبَةِ أَخِيهِ حَتَّى يَذَرَ  

رَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنْ أَبِي الطَّاهِرِ عَنِ ابْنِ وَهْبٍ