Luke 2:2-6

This was the first census taken while Quirinius was governor of Syria.

And all the people were on their way to register for the census, each to his own city.

Now 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 along with Mary, who was betrothed to him, and was pregnant.

While they were there, the time came for her to give birth.