As far as I can remember, it went:

There's a whippoorwill sweetly singing in the pale moonlight,
Whippoorwill, whippoorwil,
He sings about the honeysuckle 'round the cabin door,

........

He'll be saying, you'll be praying, I'll come back once more

....

I wish I had written it down when he used to sing it just before he died. Ah well!