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:16753 – Abū ʿAbdullāh al-Ḥāfiẓ > ʿAlī b. Ḥimshādh al-ʿAdl > al-Ḥārith b. Abū Usāmah > Kathīr b. Hishām Ḥaddathahum > Jaʿfar b. Burqān > Maymūn b. Mihrān > Abū Umāmah

[Machine] I witnessed the battle of Siffin, and they wouldn't harm the wounded, nor kill a captive, nor loot a slain person.  

البيهقي:١٦٧٥٣ – أَخْبَرَنَا أَبُو عَبْدِِ اللهِ الْحَافِظُ ثَنَا عَلِيُّ بْنُ حِمْشَاذٍ الْعَدْلُ أَنْبَأَ الْحَارِثُ بْنُ أَبِي أُسَامَةَ أَنَّ كَثِيرَ بْنَ هِشَامٍ حَدَّثَهُمْ ثَنَا جَعْفَرُ بْنُ بُرْقَانَ ثَنَا مَيْمُونُ بْنُ مِهْرَانَ عَنْ أَبِي أُمَامَةَ قَالَ

شَهِدْتُ صِفِّينَ وَكَانُوا لَا يُجِيزُونَ عَلَى جَرِيحٍ وَلَا يَقْتُلُونَ مُوَلِّيًا وَلَا يَسْلُبُونَ قَتِيلًا  

See similar narrations below:

Collected by Ḥākim
hakim:2660 – ʿAlī b. Ḥamshādh al-ʿAdl > al-Ḥārith b. Abū Usāmah > Kathīr b. Hishām Ḥaddathahum > Jaʿfar b. Burqān > Maymūn b. Mihrān > Abū Umāmah > Shahidt

[Machine] "I witnessed the Battle of Siffin and they did not provide support for the wounded, nor kill hostages, nor plunder the killed."  

الحاكم:٢٦٦٠ – حَدَّثَنَا عَلِيُّ بْنُ حَمْشَاذَ الْعَدْلُ أَنْبَأَ الْحَارِثُ بْنُ أَبِي أُسَامَةَ أَنَّ كَثِيرَ بْنَ هِشَامٍ حَدَّثَهُمْ ثنا جَعْفَرُ بْنُ بُرْقَانَ ثنا مَيْمُونُ بْنُ مِهْرَانَ عَنْ أَبِي أُمَامَةَ قَالَ

«شَهِدْتُ صِفِّينَ فَكَانُوا لَا يُجْهِزُونَ عَلَى جَرِيحٍ وَلَا يَقْتُلُونَ مُوَلِّيًا وَلَا يَسْلُبُونَ قَتِيلًا»  

هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ فِي هَذَا الْبَابِ وَلَهُ شَاهِدٌ صَحِيحٌ صحيح