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
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السيوطي:٢٢٩٨٥a –

"مَنْ كَانَ لَهُ عَبْدٌ بَينَهُ وبينَ آخَرَ فَأَعْتَقَ نَصِيبَهُ فَإِنَّهُ يقَامُ عَلَيهِ فَيَعْتِقُهُ".  

[طب] الطبرانى في الكبير عن ابن عمر

See similar narrations below:

Collected by Ṭabarānī, Nasāʾī's Kubrá
tabarani:13640 – Abū Ḥabīb Yaḥyá b. Nāfiʿ al-Miṣrī > Saʿīd b. Abū Maryam > Dāwud b. ʿAbd al-Raḥman al-ʿAṭṭār > ʿAmr b. Dīnār > Ibn ʿUmar

[Machine] I heard the Messenger of Allah ﷺ saying, "Whoever has a slave between himself and another person, and he sets him free, then he will be rewarded and the slave will be set free."  

الطبراني:١٣٦٤٠ – حَدَّثَنَا أَبُو حَبِيبٍ يَحْيَى بْنُ نَافِعٍ الْمِصْرِيُّ ثنا سَعِيدُ بْنُ أَبِي مَرْيَمَ ثنا دَاوُدُ بْنُ عَبْدِ الرَّحْمَنِ الْعَطَّارُ عَنْ عَمْرِو بْنِ دِينَارٍ قَالَ سَمِعْتُ ابْنَ عُمَرَ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «مَنْ كَانَ لَهُ عَبْدٌ بَيْنَهُ وَبَيْنَ آخَرَ فَأَعْتَقَ نَصِيبَهُ فَإِنَّهُ يُقَامُ عَلَيْهِ فَيُعْتِقُهُ»  

nasai-kubra:4920 – Qutaybah b. Saʿīd > Dāwud b. ʿAbd al-Raḥman > ʿAmr b. Dīnār > ʿAbdullāh b. ʿUmar

[Machine] I heard the Messenger of Allah ﷺ saying, "Whoever has a servant between him and another person, then let him free him, for indeed he will stand up for him and free him."  

الكبرى للنسائي:٤٩٢٠ – أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا دَاوُدُ بْنُ عَبْدِ الرَّحْمَنِ قَالَ حَدَّثَنَا عَمْرُو بْنُ دِينَارٍ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «مَنْ كَانَ لَهُ عَبْدٌ بَيْنَهُ وَبَيْنَ آخَرَ فَأَعْتَقَ نَصِيبَهُ فَإِنَّهُ يَقُومُ عَلَيْهِ فَيُعْتِقُهُ»