Common Slavic belief indicates a stark distinction between soul and body. The soul is not considered to be perishable. The Slavs believed that upon death the soul would go out of the body and wander about its neighbourhood and workplace for 40 days before moving on to an eternal afterlife.[107] Thus pagan Slavs considered it necessary to leave a window or door open in the house for the soul to pass through at its leisure. During this time the soul was believed to have the capability of re-entering the corpse of the deceased. Much like the spirits mentioned earlier, the passing soul could either bless or wreak havoc on its family and neighbours during its 40 days of passing. Upon an individual's death, much stress was placed on proper burial rites to ensure the soul's purity and peace as it separated from the body. The death of an unbaptized child, a violent or an untimely death, or the death of a grievous sinner (such as a sorcerer or murderer) were all grounds for a soul to become unclean after death. A soul could also be made unclean if its body were not given a proper burial. Alternatively, a body not given a proper burial could be susceptible to possession by other unclean souls and spirits. Slavs feared unclean souls because of their potential for taking vengeance.