Tomb Of Osiris, Necropolis Of Sheikh Abd El-Qurna, West Bank, Thebes, Egypt

Regarding the association of Osiris with the ram, the god's traditional crook and flail are 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 Andjety, and passed to Osiris later. From Osiris, they eventually passed to Egyptian kings in general as symbols of divine authority.
Mythology
The cult of Osiris (who was a god chiefly of regeneration and rebirth) had a particularly strong interest in the concept of immortality. Plutarch recounts one version of the myth in which Set (Osiris' brother), along with the Queen of Ethiopia, conspired with 72 accomplices to plot the assassination of Osiris. Set fooled Osiris into getting into a box, which Set then shut, 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 tamarind 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.