The Mezuzah
A Mezuzah is found on doorposts in Jewish homes. It is a little case, containing a tiny scroll of writing in Hebrew called the Schema. The text describes how Jewish people should love God and keep to his rules.
Every time you pass through a door with a Mezuzah on it, you touch the Mezuzah ans then kiss the fingers that touched it, expressing love and respect for God and his Mitzvoth (commandments_ and reminding yourself of the Mitzvoth contained within it. It is proper to remove a Mezuzah when one moves house and in fact it is usually recommended. If it is left in place the subsequent owner may treat it with disrespect, which is a grave sin.