These are the lyrics I have. I'm not sure they are correct.

Bethlehem lay asleeping.
Long, so long ago.
Twinkling stars were peeping.
Long, so long ago.
When to earth a baby came.
The little Jesus was his name.
So long, long ago.

Kings came to adore him.
Long, so long ago.
Knelt down low before him.
Long, so long ago.
Wandering shepherds left their sheep
To see the little Lord asleep.
So long, long ago.