[Machine] I heard the Messenger of Allah ﷺ saying: "Indeed, before the Hour there will be trials like pieces of dark smoke. The heart of a person will die from it, just as his body dies. In the morning, a person will be a believer, and in the evening, he will be a disbeliever. Similarly, a person will be a believer in the evening, and in the morning, he will be a disbeliever. People will sell their religion for a small worldly gain."
And that you should consider him dead while you are his brothers and his companions amongst those trials.