Why do you bring bread salt and wine to a new home?

It's an old tradition with roots in Russia, Judaism, Christianity, and many Eastern European cultures. Many people probably know it from Frank Capra's "It's a Wonderful Life", when George and Mary Bailey welcome the Martinis into their new home. Mary: Bread... that this house may never know hunger. [Mary hands a loaf of bread to Mrs. Martini] Mary: Salt... that life may always have flavor. [Mary hands a box of salt to Mrs. Martini] George Bailey: And wine... that joy and prosperity may reign forever. Enter the Martini Castle. [George hands Mr. Martini a bottle of wine]