For the first time in centuries the Glory of God returned to earth.
Perhaps the shepherds were caring for the flocks that would provide sacrifices for the next temple services.
It was fitting for the Good News to first be given to the Shepherds and the Lamb of God also be first given to them.
John 1:29 The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.
