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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bayhaqi:10900 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū Bakr b. Isḥāq Imlāʾ > Bishr b. Mūsá > al-Ḥumaydī > Sufyān > al-Zuhrī > Saʿīd b. al-Musayyib > Abū Hurayrah

[Machine] The Messenger of Allah ﷺ said: "Do not engage in monetary disputes (i.e. bargaining back and forth), and do not sell what is already sold to another person, and a man should not sell over the sale of his brother, and do not propose to a woman who is already engaged."  

البيهقي:١٠٩٠٠ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو بَكْرِ بْنُ إِسْحَاقَ إِمْلَاءً أنا بِشْرُ بْنُ مُوسَى ثنا الْحُمَيْدِيُّ ثنا سُفْيَانُ حَدَّثَنَا الزُّهْرِيُّ عَنْ سَعِيدِ بْنِ الْمُسَيِّبِ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ لَا تَنَاجَشُوا وَلَا يَبِيعُ حَاضِرٌ لِبَادٍ وَلَا يَبِيعُ الرَّجُلُ عَلَى بَيْعِ أَخِيهِ وَلَا يَخْطُبُ عَلَى خُطْبَتِهِ  

رَوَاهُ الْبُخَارِيُّ فِي الصَّحِيحِ عَنْ عَلِيٍّ وَرَوَاهُ مُسْلِمٌ عَنْ زُهَيْرٍ جَمِيعًا عَنْ سُفْيَانَ