Zadhan says that Sayyiduna Ibn Umar (may Allah be pleased with him) called one of his slaves and set him free, and while picking up something from the ground and pointing towards it, he said: In this act, there is not even as much reward for me, because I heard the Messenger of Allah (peace and blessings be upon him) say that whoever slaps his slave, its expiation is that he should set him free.