Mezuzah as protection

Hi,

"Rabbi Abba said: How many holy forces are prepared [to provide protection] when a person places a mezuzah on his gate! They all announce, 'This is the gate of Gd, etc.'

"The share of Israel is meritorious, and thus the Jews are known as the children of the Holy King, for all of them bear His sign…they are marked in their homes with the mezuzah at the entrance."

(Zohar, Vaetchanan pg. 266a)

Have a great day,
Mordechai