Eternal life wasn’t just about preserving the spirit. The deceased’s body also had to preserved, as the Ancient Egyptians believed the soul (ba) and life force (ka) had to return to it regularly to survive. To prevent the body from decaying, it underwent a lengthy and gruesome mummification process. Developed and refined over millennia, it allowed Ancient Egypt to produce some of the best-preserved mummies in the world, and we can now gaze upon the faces of men, women and children almost exactly as they were more than 2,000 years ago! The most complicated mummification process was developed in about 1550 BCE, and is considered the best method of preservation. During this method, the internal organs were removed, the flesh dehydrated, and the body wrapped in linen strips. This was an expensive process that took about 70 days to complete, so only the very rich could afford it. Working class people were treated with an alternative method of preservation that involved liquidising the internal organs with cedar tree oil, draining them out through the rectum and then placing the body in a salty substance called natron to dehydrate it. Embalmers were skilled artisans who had a deep knowledge of anatomy and a steady hand. They were also often priests, as performing religious rites over the deceased was an equally important part of the embalming process. The most experienced priest carried out the major parts of mummification, like the wrapping of the body. He wore a jackal mask as he did so, symbolising the presence of Anubis, god of embalming and the afterlife.
Source :
"Weird History: The World's Strangest Stories and Oddest Curiosities Revealed"