It is narrated from al-Hasan al-Basri that al-Dahhak bin Qays wrote to Qays bin al-Haytham at the time of the death of Yazid bin Mu'awiyah: Peace be upon you. To proceed: I heard the Messenger of Allah (peace and blessings be upon him) say: "Before the Hour there will be trials like pieces of smoke, in which a man's heart will die just as his body dies. In that time a man will be a believer in the morning and a disbeliever in the evening, and a believer in the evening and a disbeliever in the morning. People will sell their religion for a small gain of this world." And now Yazid has died, while you are our brothers and our own kin.