Luke 2:1, 3-7

At that time, Augustus Caesar sent an order that all people in the countries under Roman rule must list their names in a register.

And all went to their own towns to be registered. So Joseph left Nazareth, a town in Galilee, and went to the town of Bethlehem in Judea, known as the town of David. Joseph went there because he was from the family of David. Joseph registered with Mary, to whom he was engaged and who was now pregnant. While they were in Bethlehem, the time came for Mary to have the baby, and she gave birth to her first son. Because there were no rooms left in the inn, she wrapped the baby with pieces of cloth and laid him in a feeding trough.