The fairy of the house is the first person or animal that passes by when the house is under construction and leaves its shadow there. There is a refrain that is recited when you go and go to live in a new house to greet the “fairy of the house”. If I remember the words well, these are: “BBBuènn ggiòrne patrune de case, u male ièsse e u bbuène trase” (Good morning landlord, bad bait and good come in).
Instead for those who are afraid it is said: “Augur di casa, ti vogghje ben ma non t’ si facenne v’dè”. (Wish of the house, I love you but don’t show you).