Luke 2:8-12
Now there were in the same country shepherds living out in the fields, keeping watch over their flock by night. And behold, an angel of the Lord stood before them, and the glory of the Lord shone around them, and they were greatly afraid. Then the angel said to them, “Do not be afraid, for behold, I bring you good tidings of great joy which will be to all people. For there is born to you this day in the city of David a Savior, who is Christ the Lord. And this will be the sign to you: You will find a Babe wrapped in swaddling cloths, lying in a manger.”

On the night Jesus was born, shepherds were in the fields with their sheep.
The message from the angel declares the birth of Messiah and the place to find Him.
How many mangers do you think are in and around Bethlehem?
How would they know which one?
For these shepherds, who raised Passover lambs, there was only one manger to consider, the one just north of Bethlehem, Migdal-Eder, the tower of the flock.
This was their manger for the birthing of their little Passover lambs.
My theory is Joseph and Mary could not find lodging in Bethlehem so they turned toward Jerusalem, just six miles to the north.
On the way, Mary went into labor and they found the only place to provide shelter from the elements – Migdal-Eder.
The tower was easy to see from much of the road.
This brings Christ into the world as our Passover Lamb.
So, the innkeeper is not to blame.
The neighbors are not to blame.
The shepherds are not to blame.
It was the Father’s plan to fulfill scripture.