The utmost purpose of the mezuzah is to protect the house and its members from all the evil and negative situations. One of the best things about mezuzah is that it doesn’t only protect the members of the house when they are in the house, but also when they leave the house. According to Jewish ritual activity, there is a short mezuzah prayer recited by almost every Jewish person. It is customary for Jewish people to touch the mezuzah every time they pass through their door and kiss the fingers that touched it!
Please read the originial post here: https://sites.google.com/view/mezuzah-prayer/home