If you don’t know what the chalk is all about, don’t be ashamed. You’re certainly not alone.
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The Chalking of the Doors: An Epiphany Tradition Explained - OnePeterFive

If you’re a Catholic, you’ve probably seen it: a mysterious series of letters and numbers, looking for all the world like an equation, inscribed in …
Holy Cannoli
Do not attempt this at a Jewish synagogue.