Luke 2:3-6 New Revised Standard Version (NRSV)
3 All went to their own towns to be registered. 4 Joseph also went from the town of Nazareth in Galilee to Judea, to the city of David called Bethlehem, because he was descended from the house and family of David. 5 He went to be registered with Mary, to whom he was engaged and who was expecting a child. 6 While they were there, the time came for her to deliver her child.