That whoever he [Hyrum Smith] blesses shall be blessed, and whoever he curses shall be cursed; that whatsoever he shall bind on earth shall be bound in heaven; and whatsoever he shall loose on earth shall be loosed in heaven. 124:93

Trivia: What man in the Doctrine and Covenants is said to be a perfect man who looked just like his father - so much so, in fact, that they could only be distinguished by their age?