Again the Lord spoke to Ahaz, saying, Ask a sign of the Lord your God; let it be deep as Sheol or high as heaven. But Ahaz said, I will not ask, and I will not put the Lord to the test. Then Isaiah said: ‘Hear then, O house of David! Is it too little for you to weary mortals, that you weary my God also? Therefore the Lord himself will give you a sign. Look, the young woman is with child and shall bear a son, and shall name him Immanuel (Isaiah 7:10-14)
In those days a decree went out from Emperor Augustus that all the world should be registered. This was the first registration and was taken while Quirinius was governor of Syria. All went to their own towns to be registered. 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. He went to be registered with Mary, to whom he was engaged and who was expecting a child (Luke 2:1-5).