In the early modern period, distinguished Christian theologians developed elaborated witch mythologies which contributed to the intensification of witch hunts. Major works in Christian demonology, such as Malleus Maleficarum, were dedicated to the implementation of Exodus 22:18 of the Old Testament: "You shall not permit a sorceress to live." The concept of witches' sabbath was well articulated by the 17th century. Theologian Martin Delrio was one of the first to provide a vivid description in his influential "Disquisitiones magicae":