Hasan says that once Ma'qil bin Yasar (may Allah be pleased with him) fell ill. Ubaydullah bin Ziyad came to visit him during his illness and said, "O Ma'qil, do you think that I have shed anyone's blood?" He replied, "I do not know." Ibn Ziyad asked, "Do you think that I have interfered in the prices of the Muslims?" He replied, "I do not know. Lift me up and make me sit." Then he said, "O Ubaydullah, listen. I narrate to you a hadith which I have not heard from the Prophet (peace and blessings be upon him) just once or twice. I heard the Prophet (peace and blessings be upon him) say: 'Whoever interferes in the prices of the Muslims, it is incumbent upon Allah to seat him in the great part of Hell on the Day of Resurrection.'" Ibn Ziyad asked, "Did you yourself hear this hadith from the Prophet (peace and blessings be upon him)?" He replied, "Yes, not just once or twice."