Why was the Egyptian god Osiris painted on coffins?

Answer 1

Each of their paintings had great meaning to them. They believe that the hieroglyphs they make protect the dead from any harm in their afterlife. Example : A painting of a snake being killed means it will keep off evils from the dead in his afterlife.

Answer 2

The eye is a Wedjat, or Eye of Horus. It was a symbol that was meant to protect the pharoah in the afterlife and ward off evil spirits, and was also a symbol of royal power.

Answer 3

Osiris was the god of the underworld. One wanted to be on good terms with him when they died.