Ibn Umar called for a slave-boy of his and noticed a mark on his back.He asked him, "Did I hurt you?"The boy replied, "No."Ibn Umar said, "Then you are free."He then picked up something from the ground and said, "I have no more reward in this than the weight of this. I heard the Messenger of Allah ﷺ say, 'Whoever strikes his slave for an offense the slave did not commit, or slaps him, his expiation is to set him free.'"
و حدثنا محمد بن المثنى وابن بشار واللفظ لابن المثنى قالا حدثنا محمد بن جعفر حدثنا شعبة عن فراس قال سمعت ذكوان يحدث
أن ابن عمر دعا بغلام له فرأى بظهره أثرا فقال له أوجعتك قال لا قال فأنت عتيق قال ثم أخذ شيئا من الأرض فقال ما لي فيه من الأجر ما يزن هذا إني سمعت رسول الله ﷺ يقول من ضرب غلاما له حدا لم يأته أو لطمه فإن كفارته أن يعتقه