(8) باب صُحْبَةِ الْمَمَالِيكِ وَكَفَّارَةِ مَنْ لَطَمَ عَبْدَهُ
Zadhan Abl Umar reported:
I came to Ibn 'Umar as he had granted freedom to a stave. He (the narrator further) said: He took hold of a wood or something like it from the earth and said: It (freedom of a slave) has not the reward evert equal to it, but the fact that I heard Allah's Messenger (way peace be upon him) say: He who slaps his slave or beats him, the expiation for it is that he should set him free.
Reference: Sahih Muslim 1657 a
In-book reference: Book 27, Hadith 46
USC-MSA web (English) reference(deprecated numbering scheme): Book 15, Hadith 4078