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Whoso is wont to think (through envy) that Allah will not give him (Muhammad) victory in the world and the Hereafter ... let him stretch a rope up to the roof (of his dwelling), and let him hang himself. 22:15
Trivia: What should those who doubt that Allah will give Muhammad victory do?
When the doom of Allah comes, pregnant women will suffer miscarriages, and men will act like they are drunk.