"Umar bin Al-Khattab (رضي الله عنه) wanted to stone an insane woman, but ‘Ali said to him: You do not have the right to do that. He said: I heard the Messenger of Allah (ﷺ) say: “The Pen has been lifted from three: from the sleeper until he wakes up, from the child until he reaches adolescence, and from the insane person until he recovers, or comes to his senses." So "Umar (رضي الله عنه) pardoned her.