On the doorposts of traditional Jewish homes (and many not-so-traditional homes!), you will find a small case commonly known as a mezuzah, because it is placed upon the doorposts of the house. The mezuzah is not, as some suppose, a good-luck charm, nor does it have any connection with the lamb's blood placed on the doorposts in Egypt. Rather, it is a constant reminder of G-d's presence and G-d's mitzvot. These verses comprise the Jewish prayer "Shema Yisrael", beginning with the phrase: "Hear, O Israel, the LORD our God, the LORD is One" This Mezuzah has multi-colored stone decorations. Made out of white stone. A mezuzah is affixed to the doorframe of every room apart from the bathroom in a Jewish homes to fulfill the mitzvah (Biblical commandment) to inscribe the words of the Shema "on the doorposts of your house" (Deuteronomy 6:9). Some interpret Jewish law to require a mezuzah on every doorway in the home apart from bathrooms, and closets too small to qualify as rooms; others view it as necessary only to place one in the front doorway. The parchment is prepared by a qualified scribe (a "sofer stam") who has undergone many years of meticulous training, and the verses are written in black indelible ink with a special quill pen. The parchment is then rolled up and placed inside the case. The mitzvah to place mezuzot on the doorposts of our houses is derived from, a passage commonly known as the Shema. In that passage, G-d commands us to keep His words constantly in our minds and in our hearts by writing them on the doorposts of our house. The words of the Shema are written on a tiny scroll of parchment, along with the words of a companion passage. On the back of the scroll, a name of G-d is written. The scroll is then rolled up and placed in the case, so that the first letter of the Name is visible (or, more commonly, the letter Shin is written on the outside of the case). The scroll must be handwritten in a special style of writing and must be placed in the case to fulfill the mitzvah. It is commonplace for gift shops to sell cases without scrolls, or with mechanically printed scrolls, because a proper scroll costs more than even an elaborately decorated case.