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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:23127a –
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السيوطي:٢٣١٢٧a –

"من لطم مَمْلُوكه أَو ضرَبَهُ، فكفَّارَتُهُ أَنْ يُعتقهُ".  

[حم] أحمد [م] مسلم [د] أبو داود عن ابن عمر

See similar narrations below:

Collected by Abū Dāwūd
abudawud:5168 – Musaddad And ʾAbū Kāmil > Abū ʿAwānah > Firās > Abū Ṣāliḥ Dhakwān > Zādhān > Atayt Ibn ʿUmar Waqad Aʿtaq Mamlūk Lah Faʾakhadh from al-Arḍ ʿŪd or Shayʾ > Mā Lī Fīh from al-Ajr Mā Yaswá Hadhā

I came to Ibn ‘Umar when he set his slave free. He took a stick or something else from the earth and said; for me there is no reward even equivalent to this. I heard the Messenger of Allah (May peace be upon him) say: If anyone slaps or beats his slave the atonement due from him is to set him free.  

أبو داود:٥١٦٨ – حَدَّثَنَا مُسَدَّدٌ وَأَبُو كَامِلٍ قَالاَ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ فِرَاسٍ عَنْ أَبِي صَالِحٍ ذَكْوَانَ عَنْ زَاذَانَ قَالَ أَتَيْتُ ابْنَ عُمَرَ وَقَدْ أَعْتَقَ مَمْلُوكًا لَهُ فَأَخَذَ مِنَ الأَرْضِ عُودًا أَوْ شَيْئًا فَقَالَ

مَا لِي فِيهِ مِنَ الأَجْرِ مَا يَسْوَى هَذَا سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ لَطَمَ مَمْلُوكَهُ أَوْ ضَرَبَهُ فَكَفَّارَتُهُ أَنْ يُعْتِقَهُ