A mezuzah is a sacred parchment inscribed by hand with two portions of Torah. It is stored in a protective case and hung on the doorposts of Jewish homes
The Shema (Deuteronomy 6:4-9) begins with “Hear O Israel, the Lord is our God, the Lord is One.” The Shema reminds us that God is always present in our lives, and that we should keep God’s words constantly in our minds and in our hearts. The Shema tells us that one way to do this is by writing them on the doorposts of our house. Vehaya (Deuteronomy 11:13-21) assures us of God’s compensation if we fulfill his commandments (mitzvot).
It is a Torah commandment to hang mezuzot on our doorposts. Mezuzot, in turn, remind of God’s presence and of our duty to fulfill God’s commandments.
– Hear, O Israel: the LORD our God, the LORD is one.
– And thou shalt love the LORD thy God with all thy heart, and with all thy soul, and with all thy might.
– And these words, which I command thee this day, shall be upon thy heart;
– and thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thy house, and when thou walkest by the way, and when thou liest down, and when thou risest up.
– And thou shalt bind them for a sign upon thy hand, and they shall be for frontlets between thine eyes.
– And thou shalt write them upon the door-posts of thy house, and upon thy gates.