There is a tradition of blessing homes on the Feast of the Epiphany and during the weeks that follow. One way of doing this is to use blessed chalk to mark the doorway as follows:
Marking the doorway to one’s home is rooted in the Old Testament. Holy Scripture reminds us that God has at times commanded his people to mark their doors. The Israelites marked their doors with the lamb’s blood on the night of the passover (Exodus 12:7). A similar command was given with the Shema Yisrael:
Hear, O Israel: The Lord is our God, the Lord alone.
You shall love the Lord your God with all your heart,
and with all your soul, and with all your might.
Keep these words that I am commanding you today in your heart …
and write them on the doorposts of your house and on your gates.
(Deuteronomy 6:4-6, 9)
Blessing the Chalk
V. Our help is the name of the Lord:
R. The maker of heaven and earth.
V. The Lord shall watch over your going out and your coming in:
R. From this time forth for evermore.
V. The Lord be with you.
R. And also with you.
Let us pray.
Loving God, bless this chalk which you have created, that it may be helpful to your people; and grant that through the invocation of your most Holy Name all who use it in faith to write upon the doors of their homes the names of your saints, Caspar, Melchior, and Balthazar, may receive health of body and protection of soul for all who dwell in or visit their home; through Jesus Christ our Lord. Amen.