Abu 'Umar Zadhan said, "We were with Ibn 'Umar when he summoned a slave of his whom he had beaten and he uncovered his back. 'Does it hurt?' he asked. 'No,' he replied. Then he set him free. He picked up a stick from the ground and then said, 'I do not have a reward (for him) worth as much as this stick.' I asked, 'Abu 'Abdu'r-Rahman, why do you say this?' He replied, 'I heard the Prophet (ﷺ) say, "The expiation of someone who beats a slave more than he deserves or slaps his face is that he must set him free."'"
Reference: Al-Adab Al-Mufrad 180 In-book : Book 9, Hadith 25 English translation : Book 9, Hadith 180
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