وَيَعْلَمُونَ أَنَّهَا الْحَقُّ
(and know that it is the very truth.) means, that it will undoubtedly come to pass, so they prepare themselves for it and strive for its sake. It was reported through various chains of narration, a number reaching the level of being Mutawatir, in Sahih and Hasan narrations, in the Books of Sunan and Musnad. According to some versions, a man addressed the Messenger of Allah in a loud voice, when he was on one of his journeys, calling out to him, â€O Muhammad!'' The Messenger of Allah replied in a similar manner, â€Here I am!'' The man said, â€When will the Hour come'' The Messenger of Allah said,