It is narrated from Hazrat Ka'b (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "The example of a believer is like the grains of a crop which the wind keeps blowing; sometimes it levels them and sometimes it throws them to another place, until their appointed time comes. And the example of a disbeliever is like the stalks of rice that stand firm on their roots; nothing can shake them until they are all cut down at once."