Question for Kosherboy

[Vizsla Vince]

I have more than a couple of Jewish clients, & when I go to their places of business, I notice something attached to the door frame of their entryways. It looks like a small scroll or something attached about eye level, set on a slight angle, on the inner part of the door frame, on the handle side. What is this? Does it have anything to do with the Passover? What is its significance? Inquiring minds want to know...

[Recon Ron]

Kosherboy! Where are you at neighbor? I hope you're alright!

[Kosherboy]

Hi , Sorry I was in Israel, what you saw is a Mezuzah,
A mezuzah (Hebrew: מְזוּזָה‎ "doorpost") (plural: mezuzot (מְזוּזוֹת)) is a piece of parchment (often contained in a decorative case) inscribed with specified Hebrew verses from the Torah (Deuteronomy 6:4-9 and 11:13-21). These verses comprise the Jewish prayer "Shema Yisrael", beginning with the phrase: "Hear, O Israel, the LORD our God, the LORD is One"
A mezuzah is affixed to the doorframe in 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;[1] 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.
Wikipedia.