The sahir should be forced to undo what he has done, if his identity is known. It should be said to him, “Either you undo what you have done, or you will be executed.” After he has undone it, he should still be executed by the authorities, because the sahir should be killed without being asked to repent, according to the correct view. This is what was done by ‘Umar (may Allah be pleased with him), and it was narrated that the Messenger (peace and blessings of Allah be upon him) said: “The punishment of the sahir is to strike him with the sword (i.e., execute him).” When Hafsah Umm al-Muminin (may Allah be pleased with her) found out that a slave woman of hers was dealing with sihr, she killed her.