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
suyuti:26278a –
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السيوطي:٢٦٢٧٨a –

"لا يَسُمِ الْمُسْلِمُ عَلَى سَوْمِ الْمُسْلِمِ".  

[ق] البيهقى في السنن [عن أبي هريرة] (*)

See similar narrations below:

Collected by Muslim
muslim:1515a – Yaḥyá b. Ayyūb And Qutaybah b. Saʿīd And Ibn Ḥujr > Ismāʿīl Wahū Ibn Jaʿfar > al-ʿAlāʾ from his father > Abū Hurayrah

A Muslim should not purchase (in opposition) to his brother.  

مسلم:١٥١٥a – حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ وَقُتَيْبَةُ بْنُ سَعِيدٍ وَابْنُ حُجْرٍ قَالُوا حَدَّثَنَا إِسْمَاعِيلُ وَهُوَ ابْنُ جَعْفَرٍ عَنِ الْعَلاَءِ عَنْ أَبِيهِ عَنْ أَبِي هُرَيْرَةَ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَسُمِ الْمُسْلِمُ عَلَى سَوْمِ أَخِيهِ