As far as I know, it is not in Beihai collection, but in Buch der Lieder.
Later, franz schubert Schubert included it in his swan song Shi Wanneng Song.
The following is the full text of the poem, which must be true, because it is the original poem.
Dusch? nes Fischerm？ dchen，
Trebeden Kahn's land;
I left with him,
We hold hands.
Can you help me get a leg? Puchin,
I don't know what you are talking about,
You look great.
t？ Ben Wilden Mayer.
My mother took me,
The tide rises and falls,
What about manche school? ne Perle
In seiner Tiefe ruht.