Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates: Sayyiduna Ali (may Allah be pleased with him) passed by a mad woman from such-and-such tribe who had committed adultery, and Sayyiduna Umar (may Allah be pleased with him) had ordered her to be stoned. Sayyiduna Ali (may Allah be pleased with him) brought her back and said to Sayyiduna Umar (may Allah be pleased with him): "Do you not remember that the Noble Prophet (peace and blessings be upon him) said: 'The pen has been lifted from three types of people: the insane person whose mind is overcome, the sleeping person until he wakes up, and the child until he reaches puberty.'" So Sayyiduna Umar (may Allah be pleased with him) said: "You have spoken the truth." Then Sayyiduna Umar (may Allah be pleased with him) let the woman go.