
God of Resurrection, The Underworld and The Judge of Dead
Patron of: the Underworld, the dead, past Pharaohs, agriculture (old form), fertility (old form)
First child of of Geb and Nut
Brother of Seth, Nephthys, and Isis who was also his wife.
Father of Horus by Isis
Father of Anubis by Nephthys
Osiris (Asar, Aser, Ausar, Ausir, Wesir, or Ausare) was an Egyptian god, usually called the god of the Afterlife.
Osiris is one of the oldest gods for whom records have been found; one of the oldest known attestations of his name is on the Palermo Stone of around 2500 BC. He was widely worshiped until the suppression of the Egyptian religion during the Christian era. The information we have on the myths of Osiris is derived from allusions contained in the Pyramid Texts (ca. 2400 BC), later New Kingdom source documents such as the Shabaka Stone and the Contending of Horus and Seth, and much later, in narrative style from the writings of Greek authors including Plutarch and Diodorus Siculus.

Osiris was not only a merciful judge of the dead in the afterlife, but also the underworld agency that granted all life, including sprouting vegetation and the fertile flooding of the Nile River. The Kings of Egypt were associated with Osiris in death - as Osiris rose from the dead they would, in union with him, inherit eternal life through a process of imitative magic. By the New Kingdom all people, not just pharaohs, were believed to be associated with Osiris at death if they incurred the costs of the assimilation rituals.
Osiris was at times considered the oldest son of the Earth god, Geb, and the sky goddess, Nut as well as being brother and husband of Isis, with Horus being considered his posthumously begotten son. He was later associated with the name Khenti-Amentiu, which means 'Foremost of the Westerners' a reference to his kingship in the land of the dead.

Osiris was usually depicted as a green-skinned (green was the color of rebirth) pharaoh wearing the Atef crown, a form of the white crown of upper Egypt with a plume of feathers to either side. Typically he was also depicted holding the crook and flail which signified divine authority in Egyptian pharaohs, but which were originally unique to Osiris and his own origin-gods, and his feet and lower body were wrapped, as though already partly mummified. The wrapped depiction takes us to Amphibious Gods.
Anubis, Thoth, Osiris and Ma'at - Funerary Scene

Weighing of the Feather

It's all about death and resurrection.
When the Ennead and Ogdoad cosmogenies became merged, with the identification of Ra as Atum (Atum-Ra), gradually Anubis (Ogdoad system) was replaced by Osiris, whose cult had become more significant. Anubis was said to have given way to Osiris out of respect, and, as an underworld deity. Anubis was Set's son in some versions, but because Set became god of evil, he was subsequently identified as being Osiris' son. Abydos, which had been a strong centre of the cult of Anubis, became a centre of the cult of Osiris. Because Isis, Osiris' wife and sister, represented life in the Ennead, it was considered somewhat inappropriate for her to be the mother of a god associated with death such as Anubis, and so instead, it was usually said that Nephthys, the other of the two female children of Geb and Nut, was his mother.

Later, when Hathor's identity (from the Ogdoad) was assimilated into that of Isis, Horus, who had been Isis' husband (in the Ogdoad), became considered her son, and thus, since Osiris was Isis' husband (in the Ennead), Osiris also became considered Horus' father. Attempts to explain how Osiris, a god of the dead, could give rise to Horus, who was thought to be living, led to the development of the Myth of Osiris and Isis, which became a central myth in Egyptian mythology.
The myth described Osiris as having been killed by his brother Set who wanted Osiris' throne. Isis briefly brought Osiris back to life by use of a spell that she learned from her father. This spell gave her time to become pregnant by Osiris before he again died. Isis later gave birth to Horus. As such, since Horus was born after Osiris' resurrection, Horus became thought of as representing new beginnings, and vanquished Set. This combination, Osiris-Horus, was therefore a life-death-rebirth deity, and thus associated with the new harvest each year. Afterward, Osiris became known as the Egyptian god of the dead, Isis became known as the Egyptian goddess of the children, and Horus became known as the Egyptian god of the sky.
Ptah-Seker (who resulted from the identification of Ptah as Seker), who was god of re-incarnation, thus gradually became identified with Osiris, the two becoming Ptah-Seker-Osiris (rarely known as Ptah-Seker-Atum, although this was just the name, and involved Osiris rather than Atum). As the sun was thought to spend the night in the underworld, and subsequently be re-incarnated, as both king of the underworld, and god of reincarnation, Ptah-Seker-Osiris was identified.

Since Osiris was considered dead, as god of the dead, Osiris' soul, or rather his Ba, was occasionally worshipped in its own right, almost as if it were a distinct god, especially so in the Delta city of Mendes. This aspect of Osiris was referred to as Banebdjed which literally means The ba of the lord of the djed, which roughly means The soul of the lord of the pillar of stability.
One of his symbols is the djed pillar.

The djed, a type of pillar, was usually understood as the backbone of Osiris, and, at the same time, as the Nile, the backbone of Egypt. The Nile, supplying water, and Osiris (strongly connected to the vegetation) who died only to be resurrected represented continuity and therefore stability.

Osiris was linked to the constellation Orion (Sahu in Egyptian).

Osiris, Pyramids of the Giza Plateau, Belt Stars of Orion
As Banebdjed, Osiris was given epithets such as Lord of the Sky and Life of the (sun god) Ra, since Ra, when he had become identified with Atum, was considered Osiris' ancestor, from whom his regal authority was inherited. Ba does not, however, quite mean soul in the western sense, and also has to do with power, reputation, force of character, especially in the case of a god.
Since the ba was associated with power, and also happened to be a word for ram in Egyptian, Banebdjed was depicted as a ram, or as Ram-headed. A living, sacred ram, was even kept at Mendes and worshipped as the incarnation of the god, and upon death, the rams were mummified and buried in a ram-specific necropolis.
As regards the association of Osiris with the ram, the god's traditional crook and flail are of course the instruments of the shepherd, which has suggested to some scholars also an origin for Osiris in herding tribes of the upper Nile. The crook and flail were originally symbols of the minor agricultural deity Anedijti, and passed to Osiris later. From Osiris, they eventually passed to Egyptian kings in general as symbols of divine authority.
In Mendes, they had considered Hatmehit, a local fish-goddess, as the most important deity, and so when the cult of Osiris became more significant, Banebdjed was identified in Mendes as deriving his authority from being married to Hatmehit. Later, when Horus became identified as the child of Osiris (in this form Horus is known as Harpocrates in Greek and Har-pa-khered in Egyptian), Banebdjed was consequently said to be Horus' father, as Banebdjed is an aspect of Osiris.
In occult writings, Banebdjed is often called the goat of Mendes, and identified with Baphomet; the fact that Banebdjed was a ram (sheep), not a goat, apparently overlooked.

The cult of Osiris (who was a god chiefly of regeneration and re-birth) had a particularly strong interest toward the concept of immortality. Plutarch recounts one version of the myth surrounding the cult in which Set (Osiris' brother) fooled Osiris into getting into a box, which he then shut, had sealed with lead, and threw into the Nile (sarcophagi were based on the box in this myth).
Osiris' wife, Isis, searched for his remains until she finally found him embedded in a tree trunk, which was holding up the roof of a palace in Byblos on the Phoenician coast. She managed to remove the coffin and open it, but Osiris was already dead. She used a spell she had learned from her father and brought him back to life so he could impregnate her. After they finished, he died again, so she hid his body in the desert.
Months later, she gave birth to Horus. While she was off raising him, Set had been out hunting one night, and he came across the body of Osiris. Enraged, he tore the body into fourteen pieces and scattered them throughout the land. Isis gathered up all the parts of the body, less the phallus which was eaten by a fish thereafter considered taboo by the Egyptians, and bandaged them together for a proper burial. The gods were impressed by the devotion of Isis and thus resurrected Osiris as the god of the underworld. Because of his death and resurrection, Osiris is associated with the flooding and retreating of the Nile and thus with the crops along the Nile valley. [Spine of Egypt]
Diodorus Siculus gives another version of the myth in which Osiris is described as an ancient king who taught the Egyptians the arts of civilization, including agriculture. Osiris is murdered by his evil brother Set, whom Diodorus associates with the evil Typhon ("Typhonian Beast") of Greek mythology. Typhon divides the body into twenty six pieces which he distributes amongst his fellow conspirators in order to implicate them in the murder. Isis and Horus avenge the death of Osiris and slay Typhon. Isis recovers all the parts of Osiris body, less the phallus, and secretly buries them. She made replicas of them and distributed them to several locations which then became centres of Osiris worship.
The tale of Osiris becoming fish-like is cognate with the story the Greek shepherd god Pan becoming fish like from the waist down in the same river Nile after being attacked by Typhon . This attack was part of a generational feud in which both Zeus and Dionysus were dismembered by Typhon, in a similar manner as Osiris was by Set in Egypt.
Osiris was viewed as the one who died to save the many, who rose from the dead, the first of a long line that has significantly affected man's view of the world and expections of an afterlife.
Scholars such as E.A. Wallis Budge have suggested possible connections or parallels of Osiris' resurrection story with those found in Christianity: "The Egyptians of every period in which they are known to us believed that Osiris was of divine origin, that he suffered death and mutilation at the hands of the powers of evil, that after a great struggle with these powers he rose again, that he became henceforth the king of the underworld and judge of the dead, and that because he had conquered death the righteous also might conquer death. In Osiris the Christian Egyptians found the prototype of Christ, and in the pictures and statues of Isis suckling her son Horus, they perceived the prototypes of the Virgin Mary and her child."

Plutarch and others have noted that the sacrifices to Osiris were gloomy, solemn, and mournful... and that the great mystery festival, celebrated in two phases, began at Abydos on the 17th of Athyr (November 13) commemorating the death of the god, which is also the same day that grain was planted in the ground. ³The death of the grain and the death of the god were one and the same: the cereal was identified with the god who came from heaven; he was the bread by which man lives. The resurrection of the God symbolized the rebirth of the grain.' The annual festival involved the construction of 'Osiris Beds' formed in shape of Osiris, filled with soil and sown with seed.
The germinating seed symbolized Osiris rising from the dead. An almost pristine example was found in the tomb of Tutankhamun by Howard Carter.
The first phase of the festival was a public drama depicting the murder and dismemberment of Osiris, the search of his body by Isis, his triumphal return as the resurrected god, and the battle in which Horus defeated Set. This was all presented by skilled actors as a literary history, and was the main method of recruiting cult membership. According to Julius Firmicus Maternus of the fourth century, this play was re-enacted each year by worshippers who ³beat their breasts and gashed their shoulders.... When they pretend that the mutilated remains of the god have been found and rejoined...they turn from mourning to rejoicing.² (De Errore Profanorum).
Osiris was worshipped widely throughout all of Egypt, and his cult center was Abydos. The cult of Osiris continued up until the 6th century AD on the island of Philae in Upper Nile. The Theodosian decree (in about 380 AD) to destroy all pagan temples and force worshipers to accept Christianity was not enforced there.The worship of Isis and Osiris was allowed to continue at Philae until the time of Justinian. This toleration was due to an old treaty made between the Blemyes-Nobadae and Diocletian. Every year they visited Elaphantine and at certain intervals took the image of Isis up river to the land of the Blemyes for oracular purposes before returning it. Justinian would not tolerate this and sent Narses to destroy the sanctuaries, with the priests being arrested and the divine images taken to Constantinople.
References:
Wikipedia

Statues depicting the Egyptian god Osiris from 664 - 332 BCE.

Gods in the Flesh - Part Two
Thunderbolts - March 19, 2008
ALPHABETICAL INDEX OF ALL FILES