In those days a decree went out from Caesar Augustus that all the world should be registered. … And all went to be registered, each to his own town. And Joseph also went up from Galilee, from the town of Nazareth, to Judea, to the city of David, which is called Bethlehem, because he was of the house and lineage of David, to be registered with Mary, his betrothed, who was with Child. (Luke 2:1, 3-5)