Nafi' (may Allah have mercy on him) says that there was a man from the people of Sham who was a friend of Abdullah ibn Umar (may Allah be pleased with them both), and he used to correspond with him. On one occasion, Abdullah ibn Umar (may Allah be pleased with them both) wrote him a letter saying: "It has come to my knowledge that you have begun to speak about Qadar (Divine Decree). Do not write to me anymore, for I have heard the Prophet (peace and blessings be upon him) say: 'There will be some people in my Ummah who will deny Qadar.'"