That's the golden goose, and Klein misses it in his effort to be fair and comprehensive.
The Greek knew that the Jew was a wise man, and would not kill his golden goose.
But as soon as she touched her sisters, there she was, as fast as could be to the golden goose!
All night long they turned and tossed in their beds, thinking about the golden goose and longing to see it.
It was Don Tiburcio, still the guardian angel of the golden goose.
When she had had a regular good laugh, she looked at the golden goose again and thought it was so lovely that she must stroke it.
He's not going to have any one else milking his golden goose.
Its banks were not banks of issue, nor were its beds stuffed with the feathers of the golden goose.
What, and gild the swan, to show how far his golden goose can carry him?
The fun was over, the King got up, the courtiers all rose, when past came Johnny and the golden goose and all his company.
a continuous resource, esp. of wealth or profit, but which can disappear if misused