Osiris, a god of plants, agriculture, and abundance in ancient Egyptian mythology, was one of the nine pillars of Heliopolis. Before his death, he was an enlightened pharaoh who was killed by his brother Seth, the god of the desert. He was later mummified and resurrected by Anubis, becoming the ruler and death judge of the underworld. He is the king of the underworld, executing whether a person can receive eternal judgment after death.

Osiris is a green or blue mummy with a beard, holding a crank, a flail, and a scepter symbolizing supreme power, and wearing a crown. He wore a white crown symbolizing Upper Egypt, surrounded by red feathers. His skin is green, representing plants - he taught the Egyptians how to cultivate when he was king.
He is the eldest son of the Earth God Gabriel and the Sky Goddess Nut. He gave birth to Horus with his wife Isis. According to the book of the deceased, his eldest son is the baboon god Babi. Later, he was united with Sack and Buta to become "Buta Sack Osiris", also known as Heryshaf.
Although he is a god of the underworld, he is not a devil or a god of darkness. On the contrary, he symbolizes the hope that Egyptians believe in eternal glory after death. Generally, in murals, if the face is painted with green paint, it indicates that it is in the process of resurrection or has already been resurrected. Its worship ceremony originated in Abaddos, where there are many of its temples, and it became popular after the Middle Dynasty, during the 18th Dynasty of Egypt, it may have been the most widely worshipped god, and continued until late Egypt

There are several versions of the legends about Osiris, Isis, and Seth, and the following is a basic summary:
Version 1
Osiris was killed by his brother Seth, and his body was cut into many pieces. Isis retrieved these fragments (except for his genitalia) and made them into wax statues for the priests to worship. La ordered Anubis and Toth to mummify Osiris (this was the first mummy), and then Isis resurrected him. From then on, Osiris stayed in the underworld to judge the souls of the deceased, known as "Neb ertcher," meaning "King of the Edge of the World.
In the underworld 'Duat', Osiris compared the soul of the deceased with the Feather of Truth on a scale. Souls that become heavy due to sin will be devoured by Amit, while those that are light will be sent to Aaru. (This is very similar to the legend of Anubis weighing the heart, and also similar to Matt's feathers).
The pronunciation of the name of this god in the sacred script (Egyptian hieroglyphs) is not yet clear. The general view is to pronounce it as' aser ', where' a 'is a glottal stop, as you heard in Arabic and Hebrew today.

Seth conspired to kill him: he secretly ordered a coffin for Osiris, and then held a banquet to invite his relatives and friends. He announced that if this coffin was suitable for anyone, he would give it to him. Several people have tried, but none of them are suitable. So Seth encouraged his brother to give it a try. Just as Osiris lay in the coffin, Seth suddenly closed the lid and added a seal. Seth and his wife Nefertis threw the coffin into the Nile and drowned Osiris. This has caused the Nile to flood once a year.
Isis found Osiris' body in the jungle and hid it in the swamp, preparing to resurrect his husband. But Seth, who was out hunting, discovered that Seth had killed him again and divided his body into fourteen pieces, hiding them in various parts of the continent. It took Isis many years to retrieve these fragments, but not all of them were found. Only 13 were found, and some of the genitals were eaten by fish. Anubis assisted Isis in mixing the shredded meat together and wrapping it in a mummy shroud to create the first mummy, so Osiris only resurrected for one night and gave birth to a son - Horus - to avenge him.

Osiris and Isis' son Horus have been a bargaining chip for Isis to seek revenge since they were born, and he was secretly raised on the wetland of Khemnis in the Nile Delta. As Horus grew older, Isis' longing for Osiris and hatred for Seth continued to deepen. Finally, on the day Horus reached adulthood, she told everything to her smart, handsome, and burly son. After hearing this, Horus became extremely angry and immediately rushed back to Egypt to avenge his father (Isis had tried to stop him, but the feathered Horus drew his sword and cut off Isis' head, and Isis was eventually healed by Toth). At this moment, the God of Wisdom Toth appeared in front of him, telling him that with his current strength, he could not fight against the cruel Seth, The primary task is to find the double faced crown of royal power and the scepter and flail that possess divine power. Horus traveled to countless countries, encountering the gods of music and dance, Best, the goddess of heaven, Nut, the god of the atmosphere, Shu, the god of the moon, Korns, and even the sun god La. Through devout worship, fearless battles, or extraordinary wisdom, he found the double faced crown of his father Osiris, the hook and flail with divine power, and rode the trade wind to the city of Butu, This is a small city located in the southern part of ancient Egypt, and its residents are eager to return to their homeland during the era of Osiris. The arrival of Horus brought hope to the entire city, and Horus gained the support of the city's residents. Soon, other towns around him also joined in, so Horus had his own army. He led this brave army to advance towards the capital of Egypt, Thebes. Before that, the weapons used by ancient Egyptians were all primitive stone tools. Horus first invented the use of iron and installed it at the tip of an arrow. The practice of war has proven that this weapon has a high lethality and is very convenient to use. Horus' army arrived at the city of Thebes, and Seth also gathered his own army. In order to win, Seth used magic to turn the soldiers into strong crocodiles and hippos. A great war has begun. This cruel war lasted for 7 years, and in the final battle, Horus used the magical power given by his father Osiris to transform into a winged sun disk and fly into the sky, cruelly killing Seth with royal power and flail. This battle was seen by the passing god of Ra, and after the war, Ra had no choice but to appoint Horus as the new king of ancient Egypt to rule this fertile and magnificent land.