Luke 2:2-5

This was the first census taken while Quirinius was governor of Syria. And everyone went to register for the census, each to his own city. So Joseph also went up from Galilee, from the city of Nazareth, to Judea, to the city of David which is called Bethlehem, because he was of the house and family of David, in order to register with Mary, who was betrothed to him, and was with child. [Matt 1:18-25]