Osiris is a god unique to Egyptian Mythology. Known as the God of the Dead, as well as being the deity of vegetation, judgment and the beyond. In other cultures, his name is variously transcribed into Asar, Ausir, Wesir, Ausare, Hagir, Heinir, Higor, Hermes, Antar, Varor, among others.
Coming from Busiris, in Lower Egypt, it was, primitively, the deification of the force of the soil, which makes the vegetation grow; from this derived his later attributes, which extol him as the inventor of agriculture and consequently the propitiator of civilization, of which he became a kind of patron. Later, myths of him came to represent him as a mythical pharaoh who would have ruled Egypt in time immemorial, being betrayed by his own brother, Seth, who kills him to obtain the throne. Osiris, conquering death, is reborn in the Beyond, becoming the Lord of the afterlife and judge of the spirits that arrive there.
Although the trajectory from god of vegetation to god of the afterlife seems disjointed and incoherent, what is common to these attributions is the concept of cycles of life and rebirth that both vegetation and the passage to the beyond carry. Thus, it can be said that, in short, Osiris is the god of rebirth.
Osiris is one of the most popular and worshiped gods of Ancient Egypt. It was Osiris who judged the dead! In short, he decided whether the souls of mortals went to heaven or... to hell.