It is narrated from Hazrat Abdul Malik bin Mughirah, may Allah have mercy on him, that Najdah wrote to Hazrat Ibn Abbas, may Allah be pleased with them both, and inquired about the ruling regarding an old man whose intellect has vanished or who has become unintelligent. He, may Allah be pleased with him, wrote to him that when his intellect vanishes or he becomes unintelligent, he should be prevented from trade and similar activities.