Why did the ancient egyptians use the mummification process on dead

The ancient Egyptians believed that when someone died, their soul left their body. The soul would then return and be reunited with the body after it was buried. However, the soul needed to be able to find and recognise the body in order to live forever.

the two sets of lines are :

and remember beauty,five-wits,strength,and discretion ,they all at the last do everyman forsake (to leave forever ) for after death amends may no man make,for then mercy and pity doth him forsake.(to leave forever )