Every year, on Epiphany Sunday, we bless our home with the saying “Christus Mansionem Benedicat: May Christ Bless this House,” and write with chalk on each of the lintels to outside doors. The letters CMB are an abbreviation of the Latin saying above, and they’re also the first letter of each of the names of the three wise men: Caspar, Melchior and Balthazar. To find out more about this beautiful tradition, click here.
Plot Line and Sinker (Ellen Gable, Author) 
That’s a Polish tradition, too.
On Sun, Jan 7, 2018 at 12:16 PM, Plot Line and Sinker (Ellen Gable, Author) wrote:
> Ellen Gable Hrkach posted: “Every year, on Epiphany Sunday, we bless our > home with the saying “Christus Mansionem Benedicat: May Christ Bless this > House,” and write with chalk on each of the lintels to outside doors. The > letters CMB are an abbreviation of the Latin saying above, an” >