Hasan al-Basri narrates that when Yazid bin Mu'awiyah died, Sayyiduna al-Dahhak bin Qays (may Allah be pleased with him) wrote this letter to Qays bin al-Haytham: Peace be upon you. After praise and salutations: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Before the Hour there will be trials like patches of the dark night, and trials like patches of smoke, in which a man's heart will die just as his body dies. 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. In them people will sell their morals and their religion for a little of the goods of this world." And Yazid bin Mu'awiyah has died, and you are our brothers and our full brothers, so do not get ahead of us in any matter until we choose someone for ourselves.
Hadith Referenceالمعجم الكبير للطبراني / باب الضاد / 8104