Hasan (may Allah have mercy on him) says that once Sayyiduna Umar Farooq (may Allah be pleased with him) intended to stone a mad woman, so Sayyiduna Ali (may Allah be pleased with him) said to him: I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "Three types of people are exempt from accountability: (1) The sleeping person, until he wakes up, (2) The child, until he reaches puberty, (3) The insane person, until his sanity returns." Thus, Sayyiduna Umar (may Allah be pleased with him) suspended her punishment.