Abdullah bin Abbas (may Allah be pleased with them both) narrates that a man had a wife who had given birth to two of his children, and that woman used to cause harm to the Prophet Muhammad (peace be upon him). The man would stop her, but she would not desist. He tried to frighten and threaten her, but she was not afraid. One day, that woman said something inappropriate about the Prophet Muhammad (peace be upon him), so her husband took a spade, placed it on her stomach, and pressed down until the spade passed through her body (and the woman died). So the Prophet Muhammad (peace be upon him) said: "Bear witness, her blood is wasted (i.e., there is no retribution for her killing)."